STUDY ON PASSIVATING TREATMENT OF Cu-Ni ALLOY IN COMPOUND PASSIVANT CONTAINING BENZOTRIAZOLE

doi:10.3724/SP.J.1037.2012.00032

Acta Metall Sin

2012, Vol. 48

Issue (6): 744-748 DOI: 10.3724/SP.J.1037.2012.00032

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STUDY ON PASSIVATING TREATMENT OF Cu-Ni ALLOY IN COMPOUND PASSIVANT CONTAINING BENZOTRIAZOLE

WANG Yanqiu¹, SHAO Yawei¹, MENG Guozhe¹, ZHANG Tao¹,WANG Fuhui^1,2

1. Corrosion and Protection Laboratory, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001
2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016

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WANG Yanqiu, SHAO Yawei, MENG Guozhe, ZHANG Tao,WANG Fuhui. STUDY ON PASSIVATING TREATMENT OF Cu-Ni ALLOY IN COMPOUND PASSIVANT CONTAINING BENZOTRIAZOLE. Acta Metall Sin, 2012, 48(6): 744-748.

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Abstract Cu-Ni alloy has excellent corrosion resistance in marine environment and so it is widely used as seawater pipework in ships; however its corrosion resistance will decrease rapidly in sulphide--polluted seawater. Benzotriazole (BTA) is an excellent inhibitor for corrosion of copper and its alloys due to the formation of passivation film of Cu(I)BTA. In this work, passivation film was prepared on B10 Cu--Ni alloy in compound BTA passivant for improving its corrosion resistance against sulphide--polluted seawater. Corrosion resistance of the passivation films was studied by potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS); surface wettability of the films was characterized using contact angle test; X--ray photoelectron spectroscopy (XPS) was used to analyze the chemical compositions of the films. The results show that the passivation film prepared in compound passivant containing BTA and sulfosalicylic acid has better corrosion resistance than that in single BTA passivant; the higher corrosion resistance of the compound film results from synergetic effect of Cu(I)BTA and a complex compound which is a reaction product between sulfosalicylic acid and Cu alloy. Time and temperature of passivating treatment have important effects on corrosion resistance of the passivation film; prolonged treatment time and high treatment temperature are beneficial to improving corrosion resistance of the passivation film.

Key words: Cu-Ni alloy passivation sulphide corrosion resistance

Received: 13 January 2012

ZTFLH:

TG174.42

Fund:

Fundamental Research Funds for the Central Universities

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	YU Yan-Qiu
	SHAO Ya-Wei
	MENG Guo-Zhe
	ZHANG Shou
	YU Fu-Hui

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00032 OR https://www.ams.org.cn/EN/Y2012/V48/I6/744

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