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通过选择络合剂、缓冲剂及采用方波脉冲电流和优化电镀工艺,在酸性镀液中实现了Cr-Pd共镀,并在不锈钢表面制备出均匀致密且与基体结合良好的Cr-Pd合金镀层.通过改变镀液中铬盐和钯盐的相对含量,可以大范围改变镀层成分.Cr-Pd合金镀层可显著提高不锈钢在高温还原性腐蚀介质中的耐蚀性,在沸腾的20%(质量分数)H_2SO_4溶液中,Cr-Pd合金镀层使316L不锈钢的腐蚀速率降低了4个数量级以上.镀层中的Cr和Pd对致钝具有协同促进作用,当镀层中含有2.5%Pd(质量分数)时即具有明显的促进钝化效果,含33.3%Pd镀层对不锈钢的保护效果与纯Pd镀层相当.
By selecting the complexing agent, the buffer and using the square wave pulse current and optimizing the plating process, the Cr-Pd co-plating was achieved in the acidic bath and the Cr-Pd alloy was uniformly and densely bonded on the stainless steel surface Coating by changing the relative content of chromium salt and palladium salt in the bath, can change a wide range of coating composition.Cr-Pd alloy coating can significantly improve the corrosion resistance of stainless steel in high temperature reducing corrosive medium, boiling in 20% ( Mass fraction) H_2SO_4 solution, the Cr-Pd alloy coating reduces the corrosion rate of 316L stainless steel by more than 4 orders of magnitude.Cr and Pd in the coating have a synergistic promoting effect on bluntness, and when the coating contains 2.5% Pd (mass fraction) When the obvious effect of promoting passivation, with 33.3% Pd coating on the protection of stainless steel with pure Pd coating equivalent.