Pitting and Crevice Corrosion of Iron Aluminides in a Mild Acid-Chloride Solution

Kim, J. G.; Buchanan, R.A.

doi:10.5006/1.3293541

Cited by 40 publications

(15 citation statements)

References 3 publications

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“…(In general, rainfall with a pH < 5.6 is considered to be acid rain [10]). The electrolyte in this study consisted of distilled water that was adjusted to a pH of 4 (6.25×10 -5 M H 2 SO 4 ) that contains 200 ppm Cl -(5.5×10 -3 M NaCl) [11].…”

Section: Materials and Test Conditionmentioning

confidence: 99%

Effects of copper on the corrosion properties of low-alloy steel in an acid-chloride environment

2009

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The influence of Cu addition on the corrosion resistance of low-alloy steel in an acid-chloride solution was investigated by electrochemical methods, such as potentiodynamic polarization tests and an electrochemical impedance spectroscopy (EIS). The XPS analysis of the corroded surfaces indicated the formation of protective Cu2O and Cu(OH)2 layers on the surface. The formation of Cu products on the surface reduced the uniform corrosion rate of the steel, but promoted localized corrosion due to the galvanic interaction between the covered areas of copper oxide/hydroxide and the uncovered areas on the surface of steel.

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Section: Materials and Test Conditionmentioning

confidence: 99%

Effects of copper on the corrosion properties of low-alloy steel in an acid-chloride environment

2009

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“…However, once a pit formed, it propagated at a faster rate in the Fe-28Al-3Cr alloy as compared to SS 304, as indicated by the higher-active current value in the former. Buchnan and Kim (Ref 12,13) have reported that the cyclic anodic polarization testing in a H 2 SO 4 solution (pH 4, containing 200 ppm Cl -1 ions) indicates the occurrence of passivation, but with a relatively low-breakdown potential for E pit and E prot lower than the OCP. In the present study, however, a high value of E pit and E prot above OCP was found for the Fe-28Al-3Cr alloy.…”

Section: Resultsmentioning

confidence: 98%

“…However, to date, only few studies have been reported on the aqueous corrosion behavior of these materials. Buchanan and Kim (Ref 12,13) have reported pitting behavior of DO 3 type iron aluminide in acid rain type medium. Improvement in pitting and crevice resistance was found on addition of Cr and Mo (Ref 12).…”

Section: Introductionmentioning

confidence: 97%

Aqueous Corrosion Behavior of Iron aluminide Intermetallics

Sharma

Singh

Sharma

et al. 2007

J. of Materi Eng and Perform

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Iron aluminide intermetallics based on DO 3 ordered structure are being developed for use as structural materials and cladding material for conventional engineering alloys. Aqueous corrosion behavior of iron aluminides has been studied extensively by electrochemical techniques. Studies were carried out on pure Fe (99.9%), Fe-28Al (at.%), Fe-28Al-3Cr (at.%), and AISI SS 304 so as to compare and contrast their behavior in same experimental condition. Polarization behavior under different pH conditions was examined to evaluate their performance in acidic, basic, and neutral solutions. Pitting behavior was also studied in solution containing Cl -1 ions. The stability of the passive film formed was studied by current time transients and potential decay profiles. The presence of 3 at.% Cr in iron aluminides was found to improve the aqueous corrosion resistance and makes it comparable to AISI SS 304.

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“…Concentration analyses were performed by the peak-height method after linear background subtraction. The method of binding energy calibration and peak-height sensitivity factors were described elsewhere [6].…”

Section: Stress Corrosion Cracking Susceptibilities Of Fectl-based Irmentioning

confidence: 99%

“…These new intermetallic alloys have been evaluated to various degrees in terms of tensile strength, ductility, creep properties, weldability, corroison, and oxidation/' sulfidation resistance [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Stress corrosion cracking susceptibilities of Fe3Al-based iron aluminides

Kim¹

1995

Metals and Materials

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The susceptibilities to stress corrosion cracking (SCC) were investigated using the constant-potential U-bend SCC test. U-bend SCC evaluations were conducted on two iron alum/n/de compositions based on Fe3AI and containing 2 and 5 at.% Cr in acid-chloride (pH=4200 ppm CI ), thiosulfate, and tetrathionate solutions at the freely-corroding conditions. Cracking failures occurred in the thiosulfate and tetrathionate solutions, but not in the acid-chloride solution. The iron alum/n/des were very susceptible to the sulfur-bearing environments in terms of SCC and aqueous corrosion characteristics. To investigate the effect of applied potential on the cracking behavior, U-bend tests were conducted in the acid-chloride solution at an anodic pitting potential and at cathodic hydrogen-evolution potentials. Cracking occurred within 200 h only at the highly negative cathodic potentials and only for the lower Cr composition. These results indicated that two iron alum/n/des investigated are susceptible to SCC in acid-chloride solution if the corrosion potential is sufficiently active to generate hydrogen, that the cracking mechanism was related to hydrogen embrittlement. The resistance to hydrogen embrittlement cracking increased with increasing Cr content, i.e., higher Cr levels were beneficial in minimizing this form of cracking. Increased resistance to cracking for the U-bend specimens is influenced by the chemical composition of the passive film. Metallographic examinations by scanning electron microscopy revealed that increasing Cr content decreased the proportion of transgranular cleavage cracking and increased the proportion of intergranular cracking.

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Pitting and Crevice Corrosion of Iron Aluminides in a Mild Acid-Chloride Solution

Cited by 40 publications

References 3 publications

Effects of copper on the corrosion properties of low-alloy steel in an acid-chloride environment

Effects of copper on the corrosion properties of low-alloy steel in an acid-chloride environment

Aqueous Corrosion Behavior of Iron aluminide Intermetallics

Stress corrosion cracking susceptibilities of Fe3Al-based iron aluminides

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