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. 26    No. 6    June 2016

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Copper corrosion in hot and dry atmosphere environment in Turpan, China
De-cheng KONG1, Chao-fang DONG1, Yue-hua FANG2, Kui XIAO1, Chun-yun GUO2, Gang HE2, Xiao-gang LI1

1. Corrosion and Protection Center, Key Laboratory for Corrosion and Protection, Ministry of Education,
University of Science and Technology Beijing, Beijing 100083, China;
2. Xinjinang Turpan Natural Environmental Test Research Center, Turpan 838200, China

Abstract:The atmospheric corrosion behavior of pure copper exposed for three years in Turpan, China, which is a typical hot and dry atmosphere environment, was investigated using mass-loss tests, morphology observations, composition analyses, and electrochemical techniques. The results indicated that the annual corrosion rate of pure copper was approximately 2.90 μm/a. An uneven distribution of corrosion products was observed by scanning electron microscopy; this uneven distribution was attributed to the dehydration process during wet–dry and cold–hot cycles, and the compositions mainly consisted of cuprite (Cu2O) and atacamite (Cu2Cl(OH)3). Electrochemical measurements showed that deposits on copper improved its resistance to corrosion and the protectiveness decreased with increasing temperature. On the other hand, results obtained using the scanning vibrating electrode technique showed that the porous and uneven structure of the deposit layer generated a spatial separation of cathodic and anodic reaction sites, which accelerated the corrosion process in wet and rainy weather.

 

Key words: copper; atmospheric corrosion; composition analysis; electrochemical technology

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

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

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