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为了保证镀铁层同修复零件表面牢固结合,镀前必须将金属表面的氧化膜,缺陷层(冷作硬化层、显微裂纹等)刻蚀掉,同时,还必须去除在刻蚀过程中所形成的电解泥渣。在30%的硫酸溶液中(每升含有15～25克硫酸铁)进行阳极刻蚀,是零件镀铁前准备的最常用的方法。但是,零件的刻蚀质量不是在任何时候都很稳定,合金钢和淬火钢零件尤其是这样。在阳极刻蚀时,产生了一层钝化膜,这层钝化膜,可以防止零件
In order to ensure the iron plating layer with the restoration of the surface of a solid combination of the metal surface before plating must be oxide film, defect layer (cold hardening layer, micro-cracks, etc.) etched away, but also must be removed during the etching process The formation of electrolytic sludge. Anodic etching in a 30% sulfuric acid solution (15-25 grams of ferric sulfate per liter) is the most common method of preparing parts for iron plating. However, the quality of part etching is not always stable at all times, especially for alloy steel and hardened steel parts. In the anodic etching, produced a layer of passivation film, this layer of passive film, can prevent parts