Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 1    January 2010

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Influence of NaCl on dechromization of Cu-Cr-Al alloy in H3PO4 solution
LIU Yu-wen(刘玉文)1, 2, LI Ya-li(李雅莉)3, ZHANG Rui-jun(张瑞军)1, WANG Hai-yan(王海燕)2,
PENG Gui-rong(彭桂荣)1, LIU Jian-hua(刘建华)

1. State Key Laboratory of Metastable Materials Science and Technology,
Yanshan University, Qinhuangdao 066004, China;
2. Department of Basic Medical, Tangshan Vocational Technology College, Tangshan 063000, China;
3. Department of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China

Abstract:The dechromization of Cu-Cr-Al alloys was investigated by a static immersing corrosion test. The influence of NaCl on the dechromization was analyzed by electrochemical test, scanning electron microscopy, optical microscopy and X-ray fluorescence spectroscopy. The results show that the dechromization of Cu-Cr-Al alloys will take place in a H3PO4 solution of 11.32 mol/L at 55 ℃. And the corrosion process occurs initially at the interface between Cu and Cr phase, and then extends inward Cr-phase inside. The addition of NaCl into H3PO4 solutions can shorten the dechromization incubation time, decrease the dechromization temperature and concentration of H3PO4 solution, and increase the tendency of dechromization. But, the NaCl scarcely has an effect on the form and structure of chromium depleted-layer.

 

Key words: dechromization; Cu-Cr-Al alloy; H3PO4 solution; NaCl

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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