<正> 我们的工作表明,铝及铝合金表面铬酸盐转化膜为非晶结构,主要组成为γ-CrOOH·nH_2O,还含有少量氟化物。在含 K_3Fe(CN)_6处理液中所得的转化膜中还检出少量铁氰化物。本文讨论转化膜形成的影响因素及转化膜的防蚀性,并对基材表面预处理工艺作了改进。
The results of salt spraying tests indicate that the corrosion resistance of chromate conversion coatings on aluminum and its alloy is dependent on the substrate composition and on the surface pretreatment condition.The coating on L_2-Y is better than that on Ly_(12)-C_2.When an acidic(HNO_3+CrO_3+HF) pretreatment is used in place of alkaline etching,the corrosion resistance of these coatings could be markedly improved.
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