scholarly journals 2021 F.N. Speller Award Lecture: CORROSION MECHANISMS OF STEEL AND COPPER IN ENGINEERING APPLICATIONS

CORROSION ◽  
10.5006/3916 ◽  
2021 ◽  
Author(s):  
Jose M Bastidas
Keyword(s):  
Corrosion Inhibitors ◽  
Cementitious Materials ◽  
Copper Corrosion ◽  
Engineering Applications ◽  
Main Research ◽  
Structural Applications ◽  
Protection Mechanisms ◽  
Copper Tubing ◽  
Corrosion Mechanisms ◽  
Air Conditioning Systems

The main research lines of the scientific career of the author are herein, exemplified including corrosion and protection mechanisms of steel in different environments, and copper corrosion in climate systems. Stainless steel (SS) due to its high corrosion resistance is a material widely used for many engineering applications. Impedance measurements were performed on polarized at the pitting region AISI 304 SS in environment containing chloride at 25 and 60 ºC. The transfer function was analyzed indicating instability system, corroborating results obtained using the Kramers-Kronig transforms. Steel reinforcement has been studied for structural applications in civil engineering and architecture using cementitious materials, alkaline activated fly ash (AAFA), alternative to the ordinary Portland cement (OPC). The main compounds used as corrosion inhibitors in concrete were included. Carbon steel embedded in OPC mortar was tested in the presence of phosphates as corrosion inhibitors. An organic lacquer was applied to tinplate with titanium-passivation treatment and, in general, acceptable and comparable behavior was obtained to conventional chromium-passivated lacquered tinplate. Copper is also a material used in many engineering applications. Ant-nest corrosion of copper tubing in air-conditioning systems has been reported. The copper corrosion rate occasioned by carboxylic acids, formic, acetic, propionic and butyric, was included.

Strength Evaluation of Bolted Connection in PFRP Structural Member

2010 ◽  
Vol 654-656 ◽  
pp. 2640-2643 ◽  
Author(s):  
Young Geun Lee ◽  
Seung Sik Lee ◽  
Jeong Hun Nam ◽  
Hong Taek Kim ◽  
Soon Jong Yoon
Keyword(s):  
Civil Engineering ◽  
Failure Load ◽  
Structural Member ◽  
Fiber Reinforced ◽  
Engineering Applications ◽  
Bolted Connection ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Structural Applications ◽  
Bolt Holes

Fiber reinforced plastic structural shapes are readily available in civil engineering applications. Especially, pultruded fiber reinforced plastic is an attractive construction material for structural applications because it can be produced in mass production, and it has good mechanical and chemical properties compared with existing conventional structural materials. To be used in the construction field, connection of the pultruded structural member is unavoidable. Bolted connections may be the most suitable option for civil engineering applications compared with bonded connection. However, bolted connection has disadvantages such as reduction of strength due to bolt holes in the connection. Experimental and analytical studies on the bolted connection of PFRP plated member have been carried out. Four different types of connection distinguished by number and arrangement of bolt holes are investigated. Geometrical test parameters are edge distance, width, and longitudinal and transverse spacing. The effects of the parameters are evaluated and quantified based on the observations, such as failure load and failure mode, obtained from the experiment. In addition to the experimental investigation, analytical study is also conducted to predict the failure load of the member with bolted connection.

Non-Toxic Copper Corrosion Inhibitors in Different Aggressive Media

Copper ◽  
2007 ◽  
pp. 119-124
Author(s):  
E. Stupniek-Lisac ◽  
Helena Otmai
Keyword(s):  
Corrosion Inhibitors ◽  
Copper Corrosion

scholarly journals Ibuprofen as a corrosion inhibitor for copper in synthetic acid rain solution

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Zaklina Z. Tasić ◽  
Marija B. Petrović Mihajlović ◽  
Ana T. Simonović ◽  
Milan B. Radovanović ◽  
Milan M. Antonijević
Keyword(s):  
Acid Rain ◽  
Corrosion Inhibitor ◽  
Quantum Chemical ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Theoretical Calculations ◽  
Pharmaceutical Compounds ◽  
Copper Corrosion ◽  
A Value ◽  
Synthetic Acid

Abstract It is known that if unused drugs are improperly disposed, they can pollute the environment. Furthermore, researchers are still trying to find an environmentally friendly corrosion inhibitor. These factors lead to the possible application of unused pharmaceutical compounds as corrosion inhibitors. The feasibility of an anti-inflammatory, analgesic and antipyretic drug, ibuprofen, was evaluated as a potential copper corrosion inhibitor in synthetic acid rain solution. This investigation was performed by applying electrochemical and weight loss measurements and quantum chemical calculations. The results obtained by these techniques revealed the ability of ibuprofen to protect copper from corrosion. The inhibition efficiency of ibuprofen rises with increase in its concentration and can reach a value of 97.3%. The results of surface analysis of treated coupons by scanning electron microscopy and theoretical calculations are consistent with the experimental results.

scholarly journals Field Validation of Concrete Transport Property Measurement Methods

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1166 ◽  
Author(s):  
Ahmed Abd El Fattah ◽  
Ibrahim Al-Duais ◽  
Kyle Riding ◽  
Michael Thomas ◽  
Salah Al-Dulaijan ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Effective Diffusion Coefficient ◽  
Corrosion Inhibitors ◽  
Effective Diffusion ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Chloride Diffusion ◽  
Chloride Ingress ◽  
Exposure Site

Reinforcing steel corrosion, caused by chloride ingress into concrete, is the leading cause of reinforced concrete deterioration. One of the main findings in the literature for reducing chloride ingress is the improvement of the durability characteristics of concrete by the addition of supplementary cementitious materials (SCMs) and/or chemical agents to concrete mixtures. In this study, standard ASTM tests—such as rapid chloride permeability (RCPT), bulk diffusion and sorptivity tests—were used to measure concrete properties such as porosity, sorptivity, salt diffusion, and permeability. Eight different mixtures, prepared with different SCMs and corrosion inhibitors, were tested. Apparent and effective chloride diffusion coefficients were calculated using bound chloride isotherms and time-dependent decrease in diffusion. Diffusion coefficients decreased with time, especially with the addition of SCMs and corrosion inhibitors. The apparent diffusion coefficient calculated using the error function was slightly lower than the effective diffusion coefficient; however, there was a linear trend between the two. The formation factor was found to correlate with the effective diffusion coefficient. The results of the laboratory tests were compared and benchmarked to their counterparts in the marine exposure site in the Arabian Gulf in order to identify laboratory key tests to predict concrete durability. The overall performance of concrete containing SCMs, especially fly ash, were the best among the other mixtures in the laboratory and the field.

scholarly journals New inhibitors for copper corrosion

2001 ◽  
Vol 73 (12) ◽  
pp. 1861-1869 ◽  
Author(s):  
Gy. Vastag ◽  
E. Szöcs ◽  
A. Shaban ◽  
E. Kálmán
Keyword(s):  
Scanning Probe Microscopy ◽  
Corrosion Inhibitors ◽  
Quartz Crystal ◽  
High Sensitivity ◽  
Scanning Probe ◽  
Copper Corrosion ◽  
Thiazole Derivatives ◽  
Single Crystal Electrode ◽  
Copper Corrosion Inhibition

The study of the effectiveness of several potential copper corrosion inhibitors in acidic media was studied. The investigated thiazole derivative functional groups contain heterocyclic atoms such as nitrogen, sulfur, and oxygen. Thiazole derivatives, 5-benzylidene-2,4-dioxotetrahydro-1,3-thiazole (BDT) 5-(4¢-isopropylbenzylidene)-2,4-dioxotetrahydro-1,3-thiazole (IPBDT), 5-(3¢-thenylidene)-2,4-dioxotetrahydro-1,3-thiazole (TDT), and 5-(3¢,4¢-dimetoxybenzylidene)-2,4-dioxotetrahydro-1,3-thiazole (MBDT) were tested for copper corrosion inhibition properties. The electrolyte solution was 0.1 M Na2SO4. In situ information on corrosion and inhibition processes can be obtained using different techniques. Electrochemical measurements (EIS), in situ scanning probe microscopy (SPM), in addition to quartz crystal microbalance (QCM) measurements were applied. Those methods are very useful owing to their high sensitivity and resolution. Dynamic STM and AFM measurements on Cu(111) single-crystal electrode with and without the addition of some inhibitors were performed. The presence of the isopropyl group in the case of IPBDT produced far better protection against copper corrosion in acidic sulfate-containing media than the rest of the derivatives.

Investigations on Copper Corrosion Inhibitors

1991 ◽  
Vol 20-28 ◽  
pp. 2895-2900
Author(s):  
O.P. Agrawal ◽  
I.K. Bhatnagar ◽  
Virendra Kumar
Keyword(s):  
Corrosion Inhibitors ◽  
Copper Corrosion

Copper Corrosion Mechanisms of Polysulfides

1997 ◽  
Vol 492 ◽  
Author(s):  
Anne M. Chaka ◽  
John Harris ◽  
X. P. Li
Keyword(s):  
Density Functional ◽  
Copper Surface ◽  
Minor Role ◽  
Copper Corrosion ◽  
Dramatic Decrease ◽  
Functional Theory ◽  
Hartree Fock ◽  
Thiyl Radicals ◽  
Corrosion Mechanisms ◽  
A Minor

ABSTRACTCorrosive behavior of commercial organopolysulfides of the type R-(S)n-R is known to increase dramatically towards copper-based alloys when n ≥ 4, whereas di- and trisulfides are essentially inert. Three possible reasons for this behavior are examined using local and nonlocal density-functional theory as well as post-Hartree-Fock theory at the MP2 level. The hypotheses are: the shorter chains are protected from the surface by steric hindrance of the terminal organic groups, longer polysulfides can chelate copper atoms and remove them from the surface, and S-S bonds become weaker and more reactive as the polysulfide chains become longer. We find the predominant reason for the increase in corrosive behavior to be a dramatic decrease in S-S bond dissociation energy when n ≥ 4 due to stabilization of the unpaired electron via delocalization in RSS• thiyl radicals. The thiyl radicals are thus the species which is capable of attacking and corroding the copper surface. Chelation is eliminated as a possible mechanism, and steric protection and oil solubility afforded by the organic terminal groups are found to play a minor role.

Sign in / Sign up

Export Citation Format

Share Document