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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 3    June 2002

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Effect of inhibitors on corrosion behavior of
 copper-nickel in concentrated lithium
bromide solution at high temperature
HUANG Nai-bao(黄乃宝), LIANG Cheng-hao(梁成浩), 
TONG Da-wei(佟大维)

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

Abstract:The conventional mass-loss tests and the electrochemical techniques were used t o study the inhibition action of LiOH and Na2MoO4 either individually or in different combination for copper-nickel alloy in boiling 65%LiBr solution. It indicates that the corrosion rate of copper-nickel is decreased when LiOH or Na2MoO4 is added to the solution individually. LiOH concentration has a double-effect on the corrosion behavior of copper-nickel. Low concentration is benefit to forming oxide film. High concentration results in dissolution of oxide film. The optimal concentration of LiOH is 0.15mol/L. The dissolution of copper-nickel is effectively prevented when adding 200mg/L Na2MoO4 to boiling 65%LiBr solution with 0.15mol/L LiOH. The inhibition mechanism is considered that the films of Cu, Ni, Mo oxides and deposited nonprotective in soluble CuBr on the surface of metal could prevent Br- ion from absorption, which prevent alloy dissolving.

 

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

ISSN 1672-7029
CN 43-1423/U

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