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硝酸钠溶液作电解液,浓度在20％以下时对于Fe基合金有较好的非线性特性,杂散腐蚀小,成型精度高,对设备腐蚀性比氯化钠溶液小。故在加工精度较高的零件时,如整体叶轮上的叶片,汽轮机上的双联叶片汽道、锻模等加工中都广泛采用硝酸钠溶液作电解液。但用硝酸钠电解液电解加工含铬不锈钢如1Cr13、2Cr13、Cr11MoV等材料时,在电解产物中有大量的含六价铬离子的可溶化合物产生。这种Cr~(+6)离子产生的原因与硝酸钠溶液有关,因为硝酸钠是强氧化剂。在电解加工时由于阳极氧化与硝酸钠的氧化共同作用,在阳极金属表
Sodium nitrate solution for the electrolyte, the concentration of 20% or less for the Fe-based alloys have better non-linearity, less stray corrosion, high precision, the corrosion of the equipment is smaller than the sodium chloride solution. Therefore, the processing of high precision parts, such as the blade on the whole impeller, steam turbine on the two-blade road, forging dies and other processing are widely used sodium nitrate solution as electrolyte. However, electrolytic treatment of sodium nitrate electrolyte chromium-containing stainless steel, such as 1Cr13, 2Cr13, Cr11MoV and other materials, the electrolytic product has a lot of soluble compounds containing hexavalent chromium ions generated. The reason why this Cr ~ (+6) ion is produced is related to sodium nitrate solution because sodium nitrate is a strong oxidizer. In the electrolytic processing due to anodic oxidation and sodium nitrate synergies in the anode metal watch