Corrosion characterization of Sn-Zn solder: a review

2019 ◽  
Vol 31 (1) ◽  
pp. 52-67 ◽  
Author(s):  
Muhammad Firdaus Mohd Nazeri ◽  
Muhamad Zamri Yahaya ◽  
Ali Gursel ◽  
Fakhrozi Cheani ◽  
Mohamad Najmi Masri ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Potentiodynamic Polarization ◽  
Electrochemical Impedance ◽  
Alloy System ◽  
Future Research ◽  
Corrosion Properties ◽  
Content Type ◽  
Characterization Techniques ◽  
Recent Developments ◽  
Potentiostatic Polarization

PurposeThe purpose of this paper is to review and examine three of the most common corrosion characterization techniques specifically on Sn-Zn solders. The discussion will highlight the configurations and recent developments on each of the compiled characterization techniques of potentiodynamic polarization, potentiostatic polarization and electrochemical impedance spectroscopy (EIS).Design/methodology/approachThe approach will incorporate a literature review of previous works related to the experimental setups and common parameters.FindingsThe potentiostatic polarization, potentiodynamic polarization and EIS were found to provide crucial and vital information on the corrosion properties of Sn-Zn solders. Accordingly, this solder relies heavily on the amount of Zn available because of the inability to produce the intermetallic compound in between the elements. Further, the excellent mechanical properties and low melting temperature of the Sn-Zn solder is undeniable, however, the limitations regarding corrosion resistance present opportunities in furthering research in this field to identify improvements. This is to ensure that the corrosion performance can be aligned with the outstanding mechanical properties. The review also identified and summarized the advantages, recent trends and important findings in this field.Originality/valueThe unique challenges and future research directions regarding corrosion measurement in Sn-Zn solders were shown to highlight the rarely discussed risks and problems in the reliability of lead-free soldering. Many prior reviews have been undertaken of the Sn-Zn system, but limited studies have investigated the corrosive properties. Therefore, this review focuses on the corrosive characterizations of the Sn-Zn alloy system.

Recent developments in China’s biopharmaceutical industry (2012-2017)

2019 ◽  
Vol 10 (3) ◽  
pp. 686-707
Author(s):  
Marcus Conlé
Keyword(s):  
Product Innovation ◽  
Academic Research ◽  
Domestic Market ◽  
Growth Strategy ◽  
Future Research ◽  
Biopharmaceutical Industry ◽  
Content Type ◽  
Drug Regulator ◽  
Recent Developments ◽  
Product Portfolios

Purpose The paper aims to take stock of China’s recent biopharmaceutical industry development by analyzing product innovation and changes in the firms’ product portfolios during the five-year period between 2012 and 2017. Design/methodology/approach The paper introduces a classification of biopharmaceutical products. By applying the classification to the product data of China’s drug regulator, the CFDA, it becomes possible to trace the developments within the sector by looking at changes in the number of firms within each subgroup and changes in the number of subgroups in which each firm is involved. The classification allows an evaluation of the latest product innovation achievements. Findings The paper demonstrates a mild shakeout of firms in the relatively long-existing domestic market segments, a trend toward more specialized product portfolios and an enduring prevalence of innovation strategies aimed at exploiting relatively unpopulated domestic market niches instead of pioneering entirely new products. Especially the capability of upgrading to second-generation protein therapeutics has become a key criterion for separating the wheat and the chaff in China’s domestic sector. The paper moreover points out the relevance of acquisitions as a corporate growth strategy. Research limitations/implications The research does not consider complementary indicators, product pipelines in particular. Future research should compare patterns across emerging economies. Originality/value The paper is unique in using the CFDA database for systematic academic research on (bio)pharmaceutical innovation and in introducing a biopharmaceutical product classification to trace innovative activities and changes in corporate product portfolios over time.

N-cetyl-N,N,N trimethyl ammonium bromide (CTAB)-stabilized polyaniline: a corrosion inhibitor for mild steel

2018 ◽  
Vol 65 (2) ◽  
pp. 146-151 ◽  
Author(s):  
Mohd Rashid ◽  
Umesh S. Waware ◽  
Afidah A. Rahim ◽  
A.M.S. Hamouda
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Corrosion Inhibition ◽  
Potentiodynamic Polarization ◽  
Acidic Medium ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
High Dispersion ◽  
Ammonium Bromide ◽  
Content Type

Purpose The purpose of this study is to compare the inhibitive effect of polyaniline (PAni) and N-cetyl-N,N,N trimethyl ammonium bromide (CTAB)-stabilized PAni in a hydrochloric acid (HCl) medium. Design/methodology/approach PAni has been deposited potentiodynamically on mild steel in the presence of CTAB as a stabilizing agent to achieve high corrosion inhibition performance by the polymer deposition. The corrosion inhibition studies of CTAB-stabilized PAni inhibitor in 0.1 M HCl acidic solution was carried out by electrochemical methods, namely, open-circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy technique. Findings The results of electrochemical studies have shown that the CTAB-stabilized PAni inhibitor has higher corrosion efficiency than PAni on mild steel in 0.1 M HCl solution. The maximum per cent efficiency evaluated using the potentiodynamic polarization method is approximately 91.9. Originality/value CTAB-stabilized PAni has never been studied as a corrosion inhibitor for mild steel in an acidic medium. The investigations demonstrate relatively the better corrosion inhibition efficiency and high dispersion of the polymer in the acidic medium.

Corrosion behavior of in situ (TiC-TiB2)p/AZ91 magnesium matrix composites in Harrison solution

2014 ◽  
Vol 61 (5) ◽  
pp. 319-327 ◽  
Author(s):  
Mohamed Gobara ◽  
Mohamed Shamekh
Keyword(s):  
Mechanical Properties ◽  
Corrosion Behavior ◽  
Matrix Composite ◽  
Electrochemical Impedance ◽  
Magnesium Matrix Composite ◽  
Magnesium Matrix ◽  
Content Type ◽  
X Ray ◽  
Az91 Magnesium

Purpose – This paper aims to study both the mechanical properties and the corrosion behavior of the synthesized in situ (TiC-TiB2) particulates/AZ91 magnesium matrix composite and compare the results with that of the conventional AZ91D alloy. Design/methodology/approach – Scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) were used to study the surface morphology and crystalline structure. Mechanical compression tests were used to investigate the mechanical performance according to ASTM E9-89a. The corrosion behavior of the synthesized magnesium alloy was examined using both electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques in dilute Harrison solutions. Findings – The microstructure of the Mg composite showed a uniform distribution of reinforcing phases. Also, the reinforcing phases were formed without residual intermediate phases. The addition of titanium and boron carbides not only enhanced the mechanical properties of the matrix but also improve its corrosion behavior. Originality/value – This is the first time that magnesium matrix composite has been to synthesized with TiC and TiB2 particulates starting from starting from Ti and B carbides powder without adding aluminium using practical and low-cost technique (in situ reactive infiltration technique). This paper studies the corrosion behavior of synthesized Mg matrix in dilute Harrison solution and compares the results with that of conventional AZ91D.

Unfurling the cultural value of street art experiences

2020 ◽  
Vol 10 (2) ◽  
pp. 65-82
Author(s):  
Amelia Green ◽  
Steffen Gray
Keyword(s):  
Social Contexts ◽  
Cultural Value ◽  
Street Art ◽  
Future Research ◽  
Content Type ◽  
Art Form ◽  
Arts Marketing ◽  
Recent Developments ◽  
Research Stream ◽  
Part Model

PurposeThe purpose of this paper is to begin unfurling the cultural value of street art experiences by opening up an audience-centred research stream sensitive to the nuances of this art form.Design/methodology/approachThe paper develops a two-part model through which to investigate how everyday citizens experience street art. The methodology involves a purposeful literature review, and direct assessment of how the nuances of street art could pertain to audience experiences.FindingsThe first part of the model conceptualises the characteristics that distinguish contemporary street art from other art forms. To help further guide future research, the second part distinguishes six layers that frame street art audience experiences: (1) “the art”, (2) artist's intentions for the art, (3) the street artist, (4) experiential context, (5) social contexts and (6) audience interpretive lenses.Research limitations/implicationsThe investigative model provides a constructive stimulus for substantive empirical inquiries into the dynamics, complexities and implications of everyday street art experiences.Practical implicationsThe research stream developed could inform appropriate approaches to facilitating street art, and collaboration amongst street artists, facilitators, municipal representatives and policymakers.Originality/valueThe paper helps to open up an audience-centred approach to street art that intersects with recent developments in arts experience, cultural value and arts marketing.

A Multi-Scale Analysis of Mechanical Strength of Solid Catalysts

2014 ◽  
Vol 997 ◽  
pp. 375-378
Author(s):  
Zhong Dong Tao ◽  
Kai Huang ◽  
Dong Fang Wu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Fixed Bed ◽  
Future Research ◽  
Scale Analysis ◽  
Factor Analyses ◽  
Solid Catalysts ◽  
Multi Scale ◽  
Recent Developments ◽  
Multi Scale Analysis

Mechanical strength of solid catalysts involves a complex multi-scale system consisting of micro, pellet, pellet-packing and reactor scales. The damage evolution from micro to reactor scale leads to eventual rupture at the reactor level. A multi-scale framework for the mechanics of the fixed bed catalysts is proposed in this article. Some recent developments on the description of the mechanical properties on various scales, factor analyses of the mechanical properties on various scales, correlations between the damaging effects/mechanical properties on neighboring scales, etc. are reviewed, and the proposals for future research are also put forward.

Manufacturing in the world: where next?

2015 ◽  
Vol 35 (9) ◽  
pp. 1253-1274 ◽  
Author(s):  
Louis Brennan ◽  
Kasra Ferdows ◽  
Janet Godsell ◽  
Ruggero Golini ◽  
Richard Keegan ◽  
...  
Keyword(s):  
Business Models ◽  
Customer Engagement ◽  
Future Research ◽  
Content Type ◽  
New Era ◽  
The World ◽  
The Future ◽  
Recent Developments ◽  
Consistent Feature ◽  
Manufacturing Network

Purpose – The past three decades have seen the transformation of manufacturing involving its global dispersion and fragmentation. However, a number of recent developments appear to suggest that manufacturing may be entering a new era of flux that will impact the configuration of production around the globe. The purpose of this paper is to address the major emerging themes that may shape this configuration and concludes that most of them are still in their initial stages and are not likely to create a radical shift in the next few years in how manufacturing is configured around the world. These themes were presented in a special session on “Manufacturing in the World – Where Next?” at the 2013 EurOMA Conference in Dublin, Ireland. Design/methodology/approach – The paper provides a series of perspectives on some key considerations pertaining to the future of manufacturing. An evaluation of their likely impact is offered and insights for the future of manufacturing are presented. Findings – The importance of a focus on the extended manufacturing network is established. The need for customer engagement and a forward looking approach that extends to the immediate customer and beyond emerges as a consistent feature across the different perspectives presented in the paper. There is both the potential and need for the adoption of innovative business models on the part of manufacturers. Originality/value – The paper presents in-depth perspectives from scholars in the field of manufacturing on the changing landscape of manufacturing. These perspectives culminate in a series of insights on the future of global manufacturing that inform future research agendas and help practitioners in formulating their manufacturing strategies.

Effect of metal ions on the anti-corrosion properties of γ-glycidoxypropyltrimethoxysilane coatings on cold-rolled iron

2016 ◽  
Vol 63 (2) ◽  
pp. 82-88 ◽  
Author(s):  
Shengsong Ge ◽  
Menglong Li ◽  
Qian Shao ◽  
Ke Liu ◽  
Junxiang Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Design Methodology ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Coating Process ◽  
Neutral Salt ◽  
Corrosion Properties ◽  
Content Type ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Cold Rolled

Purpose – This paper aims to clarify the effect of metal ions added in the γ-glycidoxypropyltrimethoxysilane (γ-GPS) solutions on the anti-corrosion properties of the γ-GPS coatings on cold-rolled iron (CRI). Design/methodology/approach – The transformations of functional groups involved in reactions during the coating process were characterized by Fourier transformed infrared spectroscopy (FTIR), and the thickness of the γ-GPS coatings on the CRI substrates was measured using high-powered microscopy. The anti-corrosion properties of γ-GPS-treated samples were evaluated by neutral salt spray tests, polarization curves and electrochemical impedance spectroscopy measurements. Findings – The results show that Zn2+ and Mg2+ in the γ-GPS solutions promote the formation of Si-O-Si and Si-O-Fe bonds and improve the anti-corrosion properties of the γ-GPS coatings on CRI. However, Al3+ and Na+ in the γ-GPS solutions do not play this role. Originality/value – Although there have been previous research studies on the γ-GPS coatings on CRI, this paper is the first to study the effect of metal ions added in the silane solutions on the anti-corrosion properties of the γ-GPS coatings, and it has been confirmed that the anti-corrosion properties changed when Zn2+ (or Mg2+) is present.

Towards a resilient perspective in building conservation

2018 ◽  
Vol 8 (3) ◽  
pp. 309-320 ◽  
Author(s):  
Andrea Luciani ◽  
Davide Del Curto
Keyword(s):  
Climate Change ◽  
Design Methodology ◽  
Future Research ◽  
Special Focus ◽  
Contemporary Society ◽  
Sustainable Building ◽  
Content Type ◽  
Interdisciplinary Approaches ◽  
Recent Developments ◽  
Building Conservation

Purpose The purpose of this paper is to describe the cross-fertilisation process between the concept of resilience and building conservation. The authors discuss how the conservation field can address new issues posed by climate change and whether the concept of resilience plays a role within the framework of sustainable building conservation. Design/methodology/approach Starting from the use of resilience as a “travelling concept”, different interpretations of the term emerging from different fields are compared and interrelated in order to understand how this concept can impact future research in building conservation. Findings In addition to summarising recent developments in conservation theory with a special focus on how sustainability has influenced the field, this work also suggests some lines of research where resilience could foster interdisciplinary approaches to building conservation and presents some controversial outcomes. Originality/value The paper raises a discussion on how the concept of resilience could renew the field of building conservation, helping contemporary society to address the challenges of climate change.

Effect of temperature and pressure on mechanical, surface and electrochemical properties of Al-1.5Cu-5.5Zn-2.5Mg (Alumix-431)

2018 ◽  
Vol 65 (6) ◽  
pp. 558-571 ◽  
Author(s):  
Ayşe Nur Acar ◽  
Rasiha Nefise Mutlu ◽  
Abdul Kadir Ekşi ◽  
Ahmet Ekicibil ◽  
Birgül Yazıcı
Keyword(s):  
Electrochemical Properties ◽  
Surface Characterization ◽  
Electrochemical Impedance ◽  
Effect Of Temperature ◽  
Corrosion Properties ◽  
Content Type ◽  
X Ray ◽  
Good Surface ◽  
Mechanical Properties And Corrosion ◽  
Mechanical Surface

Purpose The purpose of this paper is to examine new alloys created from Alumix 431 powder and investigate their mechanical and electrochemical properties. Design/methodology/approach In this study; Alumix-431 alloy samples were prepared using the powder metallurgy (P/M) method applying cold (RT) and warm (50°C and 80°C) compaction methods under pressures of 200 and 250 MPa and were sintered at 600°C in N2(g) atmosphere. Hardness and density of the samples were measured, and corrosion properties were determined by electrochemical impedance spectroscopy charting polarization curves. Surface characterization was determined by contact angle, scanning electron microscopy/mapping, energy dispersive X-ray spectrometry and X-ray diffractometry images. Findings Alumix-431 alloys obtained upon compaction at 250 MPa/50 °C had the highest mechanical properties and corrosion resistance and good surface properties. On the surfaces of Alumix-431 alloys, α-Al, MgZn2, Al2,CuMg, Al2,O3, Al2MgO4 phases were recorded. Originality/value This study aimed to construct a correlation between mechanical and electrochemical properties of the newly created alloys (prepared under special conditions).

scholarly journals Improving the shape stability and enhancing the properties of layer dependent material extruded biodegradable polylactic acid for thin implants

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Alper Ekinci ◽  
Xiaoxiao Han ◽  
Andrew Gleadall ◽  
Andrew Allan Johnson
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Polylactic Acid ◽  
Testing Machine ◽  
Degree Of Crystallinity ◽  
Annealed Specimen ◽  
Future Research ◽  
Shape Stability ◽  
Tensile Testing Machine ◽  
Content Type

Purpose This paper aims to establish an appropriate annealing method, which is necessary for shape stability and to evaluate their potential degradation performance of 1-, 3- and 5-layer material extruded polylactic-acid specimens by enhancing their thermal and mechanical properties. Design/methodology/approach The distortion of each layered printed specimen subjected to degradation was calculated in x- and y-direction. Each layered specimen was subjected to annealing at 70°C, 80°C and 90°C for 2 h and at 80°C for 1, 4, 8 and 16 h. Thermal, molecular weight and mechanical properties were calculated using, differential scanning calorimetry, gel permeation chromatography and tensile testing machine, respectively. Findings In the x-direction, distortion was 16.08 mm for one-layer non-annealed printed specimens and decreased by 73% and 83% for 3- and 5-layer, respectively, while each layered non-annealed specimen subjected to degradation at 37°C for one month. Within the outlined study, annealing treatment enhances properties such as the degree of crystallinity (%χ) up to 34%, Young’s modulus (E) by 30% and ultimate tensile strength by 20% compared to the non-annealed specimens. Practical implications The future research accomplishments will be concentrated on the design, development and optimisation of degraded biomedical implants using material extrusion thin films including drug delivery system and fixation plates. Originality/value The printed thin specimens subjected to degradation were investigated. This research developed a new understanding of the effect of the annealing temperature and time on the mechanical, thermal and molecular weight properties for each layered specimen.

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