Structure, surface properties and corrosion resistance of St 37 steel coated with PS/Ni-Ba-B duplex coatings

2019 ◽  
Vol 373 ◽  
pp. 1-6 ◽  
Author(s):  
Sareh Rahmani ◽  
Abdollah Omrani ◽  
Sajede Shabanpanah
Keyword(s):  
Corrosion Resistance ◽  
Surface Properties ◽  
Structure Surface ◽  
Duplex Coatings

Crater Eruption Induced by High Current Pulsed Electron Beam (HCPEB) Treatment

2010 ◽  
Vol 654-656 ◽  
pp. 1700-1703 ◽  
Author(s):  
Thierry Grosdidier ◽  
Xiang Dong Zhang ◽  
Jiang Wu ◽  
Nathalie Allain-Bonasso ◽  
Ke Min Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Electron Beam ◽  
Surface Properties ◽  
Nucleation And Growth ◽  
Corrosion And Wear ◽  
Crater Formation ◽  
High Current ◽  
Negative Effects ◽  
Pulsed Electron Beam ◽  
Potential Formation

High current pulsed electron beam (HCPEB) is a fairly new technique for improving surface properties such as corrosion and wear resistances. One of the negative effects induced by HCPEB is the potential formation of craters on the surface of the HCPEB treated materials. These changes can impair the corrosion-resistance by promoting pitting. The mechanisms of nucleation and growth are detailed and the effect of the number of pulses on crater formation is discussed.

Corrosion and Wear Protection through Micro Arc Oxidation Coatings in Aluminum and Its Alloys

2019 ◽  
Author(s):  
L. Rama Krishna ◽  
G. Sundararajan
Keyword(s):  
Corrosion Resistance ◽  
Surface Properties ◽  
High Hardness ◽  
Basic Mechanism ◽  
Industrial Applications ◽  
Corrosion Properties ◽  
Micro Arc Oxidation ◽  
Coating Formation ◽  
Wear And Corrosion Resistance ◽  
Technological Limitations

This article presents the brief overview of fairly recent and eco-friendly micro arc oxidation (MAO) coating technology. The weight-cost-performance benefits in general raised the interest to utilize lightweight materials, especially the aluminum and its alloys. Despite numerous engineering advantages, the aluminum alloys themselves do not possess suitable tribology and corrosion resistance. Therefore, improvements in surface properties are essential to enable developing potential industrial applications. For improving wear and corrosion resistance of Al alloys, the most demanding surface properties are high hardness and chemical inertness. The technical and technological limitations associated with traditional anodizing and hard anodizing processes have been the strongest driving force behind the development of new MAO technology. While presenting the key technological elements associated with the MAO process, the basic mechanism of coating formation and its phase gradient nature is presented. Influence of various process parameters including the electrolyte composition has been discussed. The typical microstructural features and distribution of α- and γ-Al2O3 phases across the coating thickness as a key strategy to form dense coatings with required mechanical, tribological, and corrosion properties which are vital to meet potential application demands are briefly illustrated.

Effects of CrN/EN and Cr2O3/EN duplex coatings on corrosion resistance of ADI

2009 ◽  
Vol 517 (17) ◽  
pp. 5248-5252 ◽  
Author(s):  
Cheng-Hsun Hsu ◽  
Chun-Ying Lee ◽  
Kai-Lin Chen ◽  
Jia-Hong Lu
Keyword(s):  
Corrosion Resistance ◽  
Duplex Coatings

Novel LDPE /vermiculite/ciclopiroxolamine hybrid nanocomposites: Structure, surface properties, and antifungal activity

2020 ◽  
pp. 50232
Author(s):  
Sylva Holešová ◽  
Karla Čech Barabaszová ◽  
Marianna Hundáková ◽  
Eva Plevová ◽  
Alena Kalendová
Keyword(s):  
Antifungal Activity ◽  
Surface Properties ◽  
Hybrid Nanocomposites ◽  
Structure Surface

Analysis of corrosion behaviour and surface properties of plasma-sprayed composite coating of hydroxyapatite–tantalum on biodegradable Mg alloy ZK60

2019 ◽  
Vol 53 (19) ◽  
pp. 2661-2673 ◽  
Author(s):  
Balraj Singh ◽  
Gurpreet Singh ◽  
Buta Singh Sidhu
Keyword(s):  
Corrosion Resistance ◽  
Surface Properties ◽  
Corrosion Behaviour ◽  
Surface Hardness ◽  
Mg Alloy ◽  
Hydroxyapatite Coating ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed ◽  
Incremental Increase

Magnesium (Mg) and its alloys are promising candidates for biodegradable bio-implants. However, the excessive corrosion in the physiological environment and subsequent decline in the mechanical integrity of Mg and its alloys have limited their utility as biomaterials. In the present study, an attempt has been made to improve the corrosion resistance of Mg alloy ZK60 plasma sprayed with tantalum (Ta)-reinforced hydroxyapatite coating. The experiment was conducted with three varied levels, i.e. 10, 20 and 30 weight percent (wt%) of Ta-content in hydroxyapatite coating. The coatings were characterized and in vitro corrosion behaviour was investigated by electrochemical measurements in Ringer's solution along with the analysis of surface properties. The corrosion resistance of the Mg alloy increased with the incremental increase in Ta reinforcement in hydroxyapatite coating. An increase in the protection efficiency was analysed for the Ta-reinforced hydroxyapatite coatings (∼10%, 18% and 23% for hydroxyapatite-10Ta, hydroxyapatite-20Ta and hydroxyapatite-30Ta, respectively) as compared to the pure hydroxyapatite coating. The hydroxyapatite coating effectively increased the surface hardness of the Mg alloy and Ta reinforcement further enhanced it. Surface roughness decreased with the incremental increase in Ta-content in hydroxyapatite coating. Wettability analysis revealed the hydrophilic nature of pure hydroxyapatite and Ta-reinforced hydroxyapatite coatings. The results of the study suggest that the proposed Ta reinforcement in hydroxyapatite is potentially important for biodegradable Mg bio-implants.

Investigation of structure–surface properties relationship of semi-fluorinated polymerizable cationic surfactants

2013 ◽  
Vol 408 ◽  
pp. 125-131 ◽  
Author(s):  
Chahinez Benbayer ◽  
Salima Saidi-Besbes ◽  
Elisabeth Taffin de Givenchy ◽  
Sonia Amigoni ◽  
Frédéric Guittard ◽  
...  
Keyword(s):  
Surface Properties ◽  
Cationic Surfactants ◽  
Structure Surface ◽  
Relationship Of

scholarly journals Effect of shot peening on the surface properties, corrosion and wear performance of 17-4PH steel produced by DMLS additive manufacturing

2021 ◽  
Vol 21 (4) ◽  
Author(s):  
Mariusz Walczak ◽  
Mirosław Szala
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Additive Manufacturing ◽  
Surface Properties ◽  
Shot Peening ◽  
Surface Defects ◽  
Wear Behaviour ◽  
Fatigue Wear ◽  
Steel Shot

AbstractComponents produced by additive manufacturing (AM) via direct metal laser sintering (DMLS) have typical as-fabricated surface defects. As a result, surface properties of AM products should be modified to increase their strength, anti-wear behaviour, and at the same time to ensure their high corrosion resistance. Surface modification via shot peening is considered suitable for additive manufacturing of medical devices made of 17-4PH stainless steel. The objective of this study was to determine the effect of shot peening pressures (0.3 MPa and 0.6 MPa) and three types of blasting media (CrNi steel shot, nutshell granules and ceramic beads) on the tribological characteristics and corrosion resistance of specimens of DMLS 17-4PH stainless steel. Results demonstrated that shot peening caused steel microstructure refinement and—except for the nutshell shot-peened specimens—induced both martensite (α) formation and retained austenite (γ) reduction. 17-4PH specimens peened with steel and ceramic shots showed the highest increase in surface hardening by approx. ~ 119% (from 247 to 542 HV), which significantly improved their wear resistance. The highest mechanical properties (hardness and wear resistance) and corrosion resistance were obtained for the surfaces modified using the following media: ceramic beads > CrNi steel shot > nutshell granules. Adhesive and fatigue wear were two predominant mechanisms of tribological deterioration. Results demonstrated that the application of shot peening using ceramic beads led to grain size refinement from 22.0 to 14.6 nm and surface roughness reduction, which in turn resulted in higher corrosion resistance of the material. DMLS 17-4PH specimens modified by shot peening using ceramic beads and a pressure of 0.6 MPa exhibited the optimum surface morphology, hardness and microstructure, and thus improved wear and corrosion performance.

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