Study on the process parameters of electrolytic phosphating
WANG Lei1, YUAN Lin1, XU Yu-dong1, SHI Min1, QI San1,2, DING Ning2
(1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 2. Bengbu Yucheng New Materials Science & Technology Ltd. Co. , Bengbu 233000, Anhui,China)
Abstract:A new kind of electrochemical phosphating was developed and its key process parameters were optimized through a series of designed orthogonal experiments. The optimal parameters which were assessed by appearance, film thickness and corrosion resistance,i. e, phosphating time,electrolytic current density,total acid value and phosphating temperature are 60 s, 0. 4 A/dm2,110 points and 25 ℃, respectively. Crystal morphology and main composition of electrochemical phosphating coating were analyzed by SEM, EDS and XRD. Results showed that the coating which was uniformly deposited on the carbon steel substrate under the optimal phosphating condition was mainly composed of spherical structured Zn3(PO4)2·4 (H2O) grains. Furthermore, experiments indicated that the electrochemical phosphating is free of slag and does not contain any harmful ions, which implies that this metal pretreatment process is effective and “green” for environmental protection.
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WANG Lei, YUAN Lin, XU Yu-dong, SHI Min, QI San,, DING Ning. Study on the process parameters of electrolytic phosphating. , 2015, 22(3): 35-40.
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