Effect of Acetic Acid on the Pitting Corrosion of 2Cr12MoV Turbine Steel in Early Condensates Containing Chloride Ions

2017 ◽  
pp. 3166-3178 ◽  
Author(s):  
Jiaqiang Wei ◽  
Keyword(s):  
Acetic Acid ◽  
Pitting Corrosion ◽  
Chloride Ions ◽  
Turbine Steel

scholarly journals The Effect of the Corrosion Medium on Silane Coatings Deposited on Titanium Grade 2 and Titanium Alloy Ti13Nb13Zr

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6350
Author(s):  
Oliwia Kierat ◽  
Agata Dudek ◽  
Lidia Adamczyk
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Acetic Acid ◽  
Pitting Corrosion ◽  
Chloride Ions ◽  
Distilled Water ◽  
Corrosion Medium ◽  
Anhydrous Ethyl Alcohol ◽  
Bromide Ion ◽  
Titanium Grade

The present paper focuses on the fabrication of coatings based on vinyltrimethoxysilane and the influence of various corrosion media on the coatings produced. Coatings were deposited on two substrate materials, namely, titanium Grade 2 and titanium alloy Ti13Nb13Zr, by immersion in a solution containing vinyltrimethoxysilane, anhydrous ethyl alcohol, acetic acid and distilled water. The obtained coatings were characterized in terms of surface morphology, adhesion to the substrate and corrosion resistance. As corrosion solutions, four different simulated physiological fluids, which differed in the contents of individual ions, and a 1 mol dm−3 NaBr solution were used. The chloride ions contained in the simulated physiological fluids did not lead to pitting corrosion of titanium Grade 2 and titanium alloy Ti13Nb13Zr. This investigation shows that titanium undergoes pitting corrosion in a bromide ion medium. It is demonstrated that the investigated coatings slow down corrosion processes in all corrosion media examined.

Pitting Corrosion Behaviour of Boron Added Modified 9Cr–1Mo Steel: Combined Effects of Alkali and Chloride Ions

2014 ◽  
Vol 68 (1) ◽  
pp. 129-141 ◽  
Author(s):  
Namrata Upadhyay ◽  
M. G. Pujar ◽  
C. R. Das ◽  
Nanda Gopal Krishna ◽  
C. Mallika ◽  
...  
Keyword(s):  
Pitting Corrosion ◽  
Corrosion Behaviour ◽  
Chloride Ions ◽  
Combined Effects

Low Potential Pitting Corrosion of Ni-Cr-Fe Alloys in Chloride Plus Thiosulfate Solutions: Determination of Potential and Concentration Boundaries

CORROSION ◽  
10.5006/3562 ◽  
2020 ◽  
Vol 76 (8) ◽  
pp. 786-795
Author(s):  
Abraham A. Becerra Araneda ◽  
Mariano A. Kappes ◽  
Martín A. Rodríguez ◽  
Ricardo M. Carranza
Keyword(s):  
Pitting Corrosion ◽  
Chloride Ions ◽  
Aged Alloy ◽  
Electrochemical Tests ◽  
Alloy 800 ◽  
Chloride Threshold ◽  
Alloy 690 ◽  
Fe Alloys ◽  
Thiosulfate Concentration

Low potential pitting corrosion (LPPC) of Alloys 690 and 800 (UNS N06690 and N08800) was studied in neutral solutions, containing chloride ions from 0.1 M to 1 M and thiosulfate ions from 5 × 10−5 M to 10−3 M. LPPC occurred close to the corrosion potential (–0.25 VAg/AgCl) by a synergic effect of the chloride and thiosulfate ions. The threshold concentrations of aggressive species for LPPC occurrence were identified by potentiostatic tests with mechanical scratching of the surface, which yielded more conservative estimations compared to other electrochemical tests. The ranges of potential and concentration of chloride and thiosulfate where LPPC occurred and where it merged with the conventional chloride pitting were determined. The lowest threshold concentrations were measured in Alloy 800, with a lower Cr content than Alloy 690. Thermally-aged Alloys 800 and 690 had lower resistance to LPPC than the corresponding solution-annealed material. In 1 M chloride-based solutions, for aged Alloy 800, LPPC occurred at a thiosulfate concentration as low as 5 × 10−5 M; in 10−3 M thiosulfate-based solutions, the chloride threshold was 0.1 M. For thermally-aged alloys, pits propagated intergranulary in some experiments. In solutions with chloride and thiosulfate concentrations close to the threshold required for pitting, repassivation of LPPC was observed after a sustained period of pit growth, originally initiated by scratching the surface. Such a repassivation has not been reported before in the literature in chloride and thiosulfate solutions. Two possible explanations were presented for this phenomenon.

Research on the Failure Mechanism of Pitting Corrosion of the 304 Stainless Steel in Chloride Ions Environment

2012 ◽  
Vol 502 ◽  
pp. 12-16
Author(s):  
Yi Pan ◽  
Rong Fa Chen ◽  
Du Xiong Wang ◽  
Guo Sheng Cai ◽  
Xian Liang Zhang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Rate ◽  
Failure Mechanism ◽  
Pitting Corrosion ◽  
Chloride Ion ◽  
Chloride Ions ◽  
304 Stainless Steel ◽  
Cr Content ◽  
Experiment Method ◽  
Ion Impact

The Mechanism of 304 Stainless Steel Pitting Corrosion Was Researched in Chloride Ions Environment. the Metallographic Microstructure of Areas near the Pitting Corrosion and Far Away from the Pitting Corrosion Were Observed by the Metallographic Experiment；Cr Content of the Sample Was Determined by EDXRF, to Prove Chloride Ion Impact on the Element Cr of 304 Stainless Steel. Finally, Corrosion Rate of Specimens Was Determined by Piecewise Experiment Method to Prove Otherness for Corrosion Rate in Different Period of 304 Stainless Steel in Chloride Ions Environment.

Passivation and pitting corrosion of α-brass (Cu/Zn: 63/37) in neutral buffer solutions containing chloride ions

1990 ◽  
Vol 41 (11) ◽  
pp. 635-639 ◽  
Author(s):  
H. A. Abd El-Rahman
Keyword(s):  
Pitting Corrosion ◽  
Chloride Ions ◽  
Buffer Solutions

Effect of severe plastic deformation by ECAP on corrosion behaviour of aluminium alloy AA 7075

2016 ◽  
Vol 81 (2) ◽  
pp. 55-61 ◽  
Author(s):  
M. Ilieva ◽  
R. Radev
Keyword(s):  
Corrosion Resistance ◽  
Aluminium Alloy ◽  
Equal Channel Angular Pressing ◽  
Pitting Corrosion ◽  
Corrosion Behaviour ◽  
Chloride Concentration ◽  
Chloride Ions ◽  
Angular Pressing ◽  
Pitting Corrosion Resistance ◽  
Aa 7075

Purpose: The present study compares the corrosion behaviour of overaged AA 7075 before and after equal channel angular pressing ECAP in two media, containing chlorides, in order to answer the question how grain refinement of aluminium alloys influences their corrosion properties.Design/methodology/approach: The effect of equal channel angular pressing ECAP on corrosion behaviour of aluminium alloy AA 7075 was studied in two water solutions, containing chloride ions: 1) 0.01 M Na2SO4 with addition of 0.01%Cl-, and 2) 3g/l H2O2 and 57g/l NaCl. The changes in electrochemical characteristics, provoked by grain size refinement after equal channel angular pressing ECAP, were found using potentiodynamic polarisation. Steady state potential, corrosion potential, corrosion current density; breakdown (pitting) potential of overaged and deformed by equal channel angular pressing ECAP aluminium alloy AA 7075 were measured.Findings: In the environment with lower chloride concentration equal channel angular pressing ECAP process led to increase in pitting corrosion resistance and in the medium with higher chloride concentration - to decrease in pitting corrosion resistance. That way grain refinement does not demonstrate a uni-directional influence on corrosion resistance of AA 70775.Research limitations/implications: The results suggest the possibility for development of materials having the same chemical composition but with different corrosion resistance to different environments.Originality/value: The paper presents the corrosion behaviour of ultrafine-grained aluminium alloy AA 7075 and the influence of the chloride ions concentration in the corrosion medium on this behaviour.

Pitting Corrosion of Pipeline Steel in Dilute Bicarbonate Solution with Chloride Ions

CORROSION ◽  
1994 ◽  
Vol 50 (9) ◽  
pp. 651-657 ◽  
Author(s):  
X. Mao ◽  
X. Liu ◽  
R. W. Revie
Keyword(s):  
Pitting Corrosion ◽  
Pipeline Steel ◽  
Chloride Ions

Density-functional theory investigation of Al pitting corrosion in electrolyte containing chloride ions

2015 ◽  
Vol 357 ◽  
pp. 2028-2038 ◽  
Author(s):  
Min Liu ◽  
Ying Jin ◽  
Chuanhui Zhang ◽  
Christofer Leygraf ◽  
Lei Wen
Keyword(s):  
Density Functional Theory ◽  
Pitting Corrosion ◽  
Density Functional ◽  
Chloride Ions ◽  
Functional Theory
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