Influence of NaCl on dechromization of Cu-Cr-Al alloy in H3PO4 solution

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 1; pp. 123 - 127
• Main Author: 刘玉文 李雅莉 张瑞军 王海燕 彭桂荣 刘建华
• Format: Journal Article
• Language: English
• Published: 2010
• Subjects: Al合金; NaCl溶液; X射线荧光光谱; 扫描电子显微镜; 磷酸溶液; 铜铬合金
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60108-4

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 NaC1 scarcely has an effect on the form and structure of chromium deoleted-laver.