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彩色,多用化学成膜法获得。 E.Beraha和B.Shpigler把化学着色剂分为五类: (1) 偏重亚硫酸盐-硫代硫酸盐试剂; (2) 硒酸试剂; (3) 钼酸盐试剂; (4) 复合硫代硫酸盐试剂: (5) 铬酸盐试剂。为了分辨亚温淬火钢中微量的未溶铁素体以及纤维相间的M-F组织,我们对上述着色剂进行了着色试验,并在钼酸盐试剂的基础上,发展了一种操作简便,使用时间较长,着色效果明显,重现性较好的试剂,即酸化了的钼酸钠和偏重亚硫酸钠的混合液。
Color, multi-chemical film obtained. E. Beraha and B. Shpigler classify chemical colorants into five categories: (1) biased sulfite-thiosulfate reagents; (2) selenic acid reagents; (3) molybdate reagents; (4) Sulfate reagent: (5) Chromate reagent. In order to distinguish between the trace amount of undissolved ferrite in the sub-tempered hardened steel and the MF structure of the fiber phase, we colored the above coloring agent and developed a simple and easy-to-use method based on the molybdate reagent Longer, colorable, reproducible, ie, a mixture of acidified sodium molybdate and sodium metabisulfite.