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运用综合的电化学方法与原子吸收光谱技术,研究阳极时效时间及其电解液对Fe-31Mn-7Cr合金于50％HNO3或1molL-1Na2SO4溶液中形成的钝化膜的稳定性与耐蚀性的影响.在阳极钝化电位中区,延长Fe-31Mn-7Cr合金在50％HNO3或1molL-1Na2S04水溶液中阳极时效时间能增加钝化膜的稳定性与防护性,随之进一步改善合金的耐腐蚀抗力.由1 molL-1Na2SO4水溶液中阳极极化曲线各参数所表征的Fe-31Mn-7Cr(经1mol L-1Na2S04阳极时效5h后)的耐腐蚀性能接近于1Cr13不锈钢的水平.在强氧化性的50％HN03溶液中阳极时效表面改性的效果明显优于在中性的1 molL-1Na2SO4溶液中改性者.表面改性后,抗腐蚀性能的提高主要归因于钝化膜中Cr氧化物的富集与Fe和Mn氧化物的贫乏.
The electrochemical method and atomic absorption spectroscopy were used to study the anodic aging time and the stability and corrosion resistance of the electrolyte on the passivation film of Fe-31Mn-7Cr alloy in 50% HNO3 or 1molL-1Na2SO4 solution Effect.At the anodic passivation potential in the area, to extend the anodic aging time of Fe-31Mn-7Cr alloy in 50% HNO3 or 1molL-1Na2S04 aqueous solution can increase the stability and protective passivation film, followed by further improve the corrosion resistance of the alloy The corrosion resistance of Fe-31Mn-7Cr (after aging at 1mol L-1Na2S04 for 5h), which is characterized by the parameters of anodic polarization curve in 1 molL-1Na2SO4 aqueous solution, is close to the level of 1Cr13 stainless steel.In strongly oxidizing The effect of anodic aging surface modification in 50% HN03 solution is obviously better than that in neutral 1 molL-1Na2SO4 solution.After the surface modification, the improvement of corrosion resistance is mainly attributed to Cr oxide The enrichment is depleted with Fe and Mn oxides.