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采用电化学着色法对不锈钢着黑色进行了研究,讨论了钝化处理、着色液组成等因素对着色的影响,测定了着色膜的耐磨性和耐蚀性,并根据着色膜的组成、微观结构分析了成膜机理.结果表明:钝化和封闭处理能明显提高着色膜的耐磨性和抗色变性;电化学分析表明在1 mol/L H2SO4溶液、3.5%NaC l溶液和10%NaOH溶液中,着色膜腐蚀电位比不锈钢基体分别正移1130、565和790 mV,且腐蚀电流密度都比相应介质中的小;扫描电镜和能谱结果显示膜层为封闭块状结构,着色膜主要成分是Fe、Cr、Mn等元素,封闭处理能明显减少其裂纹数目.该成膜反应机理为:1)不锈钢基体的溶解形成大量的M e2+;2)金属/溶液界面上的M e2+与Cr3+水解形成合金氧化膜沉积在基体表面上;3)电化学致密过程中4H2MoO4+2SO42-+4H+2(MoO)2SO4+6H2O+6[O]和M e+[O]=M eO反应是着色膜致密的主要原因.
Electrochemical staining was used to study the blackness of stainless steel. The effects of passivation treatment, coloring liquid composition and other factors on the coloring were discussed. The wear resistance and corrosion resistance of the colored film were measured. According to the composition of the colored film and microstructure The results show that the passivation and sealing treatment can significantly improve the wear resistance and the anti-discoloration resistance of the colored film. Electrochemical analysis shows that in 1 mol / L H2SO4 solution, 3.5% NaCl solution and 10% NaOH In the solution, the corrosion potentials of the colored films were shifted 1130, 565 and 790 mV, respectively, compared with that of the stainless steel substrates, and the corrosion current densities were smaller than those in the corresponding media. SEM and EDS showed that the films were closed lumps, The composition is Fe, Cr, Mn and other elements, the sealing treatment can significantly reduce the number of cracks.The film forming reaction mechanism: 1) dissolution of stainless steel matrix to form a large number of M e2 +; 2) metal / solution interface M e2 + and Cr3 + Hydrolyzed to form an alloy oxide film deposited on the surface of the substrate; 3) 4H2MoO4 + 2SO42- + 4H + 2 (MoO) 2SO4 + 6H2O + 6 [O] and M e + [O] = M eO reactions during the electrochemical densification are colored films The main reason for the dense.