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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 6    December 2002

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Corrosion behavior of sintered zinc-aluminum
coating in NaCl solution
CHEN Ling(陈 玲)1, LI Ning(李 宁)2,ZHOU De-rui(周德瑞)2

1. Environment and Chemical Engineering Department,
Yan Shan University, QinHuangDao 066004, China;
2. Applied Chemistry Department, Harbin Institute of Technology, 
Harbin 150001, China

Abstract:Sintered zinc-aluminum coating (SZAC) was prepared using zinc flakes, aluminum flakes and CrO3 as main raw materials. The corrosion behavior of SZAC in 3.5%NaCl solution was studied by means of SEM, EDS, EIS and so on. Results indicate that aluminum corroded in advance of zinc to produce speculate or spherical substances, which attaches to SZAC and adds mass to it. Corrosion production passivates metal powders in SZAC, causes Ecorr of SZAC to increase gradually, and causes the arising of the third time constant in EIS, which corresponds to the insulation of corrosion production.

 

Key words:  sintered zinc-aluminum coating; corrosion behavior; NaCl solution

ISSN 1672-7029
CN 43-1423/U

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