三价铬基转化膜生长动力学研究现状及进展

王来滨, 刘侠和, 王梅, 高俊杰

Research Status and Progress on Growth Kinetics of Trivalent Chromium-based Conversion Film

WANG Laibin, LIU Xiahe, WANG Mei, GAO Junjie

表1 TCC膜生长过程OCP随浸泡时间的演变规律[15-24]

Table 1 Evolution rule of OCP vs time during the growth of TCC coating[15-24]

Stage Environment Oxide layers on base Regularity of corrosion potential References Two stages pH1.2~4 SurTec 650 solution, ＜600 s Cr(III)-based film on Al or Al alloy Potential decreases first and then tend to stabilize [15,16] Three stages pH 2.0-4.0 Socosurf TCS solution, ＜1200 s Cr(III)-based film on Al or Zn The potential first decreases, then increases, and finally stabilizes [17-22] Four stages pH2.0 Cr(NO3)3 base solution, ＜1200 s Cr(III)-based film on Zn The potential first decreases, increases, then decreases and finally stabilizes [23,24]