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表面发黑广泛应用于表面防腐及装饰,但由于发黑液采用硒盐,成本较高,污染大。逐步向钼系、Ｓ系等发展。常温低钼型发黑,具有低成本、结合力好且钼含量较低特点,足以形成一层深黑色膜。解决了发黑膜结合力差等缺点。1 发黑工艺配方钼酸铵,ｇＬ1～1.5Ｎａ2Ｓ2Ｏ3,ｇＬ25～...
Black surface is widely used in surface corrosion and decoration, but due to the use of selenium black liquor, the higher the cost, pollution. Gradually to molybdenum, S system development. Low temperature and low molybdenum black, with low cost, good binding and low molybdenum content characteristics, enough to form a layer of deep black film. Solve the black film poor bonding and other shortcomings. 1 black process formula ammonium molybdate, gL1 ~ 1.5Na2S2O3, gL25 ~ ...