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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 3    June 2005

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Inhibition effects of PMA/SbBr3 complex inhibitor on copper and copper-nickel alloy in LiBr solutions
HU Xian-qi(扈显琦), LIANG Cheng-hao(梁成浩), HUANG Nai-bao(黄乃宝

School of Chemical Engineering, Dalian University of Technology, 
Dalian 116012, China

Abstract:The effects of PMA/SbBr3 inhibitor on copper and copper-nickel alloy in 55%LiBr solution were investigated by chemical immersion and electrochemical measurements. The results indicate that in boiling 55%LiBr solution containing PMA/SbBr3 inhibitor, corrosion rates of copper and copper-nickel alloy are 67.48μm/a and 38.14μm/a, respectively. Since both anodic and cathodic electrochemical reactions can be inhibited, PMA/SbBr3 belongs to complex inhibitor. PMA has the effect of inhibiting hydrogen evolution and [PMo12O40]3-, the anion of PMA, has a strong oxidizing effect. Sb3+ also shows an oxidizing effect. It may exist in LiBr solutions stably with PMA. Because of the synergistic effect of PMA and Sb3+, a protective film, comprising CuO, Cu2O and Sb, formed on copper and copper-nickel alloy surface may prevent Br- from diffusing to the surface of metals. As a result, the anticorrosion performance of copper and copper-nickel alloy may be improved.

 

Key words: copper; copper-nickel alloy; lithium bromide; corrosion; inhibitor

ISSN 1672-7029
CN 43-1423/U

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