The effect of hydrostatic pressure on the corrosion of nickel in slightly alkaline solutions containing Cl− ions

The effect of hydrostatic pressure on nickel corrosion in 0.58 M NaCl solution and in sea water at pH 8.2 and at 20°C has been investigated. By increasing the hydrostatic pressure, the corrosion rate and the susceptibility to pitting of nickel increase in NaCl solution and decrease in sea water. Thi...

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Bibliographic Details
Published in:Corrosion science 1989, Vol.29 (4), p.403-416
Main Authors: Beccaria, A.M., Fiordiponti, P., Mattogno, G.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Specific materials
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Summary:The effect of hydrostatic pressure on nickel corrosion in 0.58 M NaCl solution and in sea water at pH 8.2 and at 20°C has been investigated. By increasing the hydrostatic pressure, the corrosion rate and the susceptibility to pitting of nickel increase in NaCl solution and decrease in sea water. This has been explained by the different nature of the corrosion layers formed in these solutions, being the nickel corrosion products in NaCl mainly formed by nickel oxides and/or hydroxides and in sea water by nickel oxides and/or hydroxides and Ni-Mg carbonates. By increasing the hydrostatic pressure nickel oxides can be converted into soluble oxychlorides forming pits initiation sites, while Mg carbonates or oxycarbonates, having greater concentration in the corrosion layer, increase its covering power and resistance to pitting.
ISSN:0010-938X
1879-0496
DOI:10.1016/0010-938X(89)90095-4