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实验证明,三价铬和草酸盐在溶液中以一定配此混和加热或在室温下放置较长时间,都能发生反应,生成相应的络合物。本文采用浓差递变法和纸上电泳试验,确定了它们的组成分别为:[Cr(C_2O_4)(H_2O)_4]~+、[Cr(C_2O_4)_2(H_2O)_2]~-、[Cr(C_2O_4)_3]~(3-)。又通过不同配比络合物镀液的赫尔槽试验,以及对连续电镀过程中Cr(Ⅵ)的积累、镀液寿命等的分析,比较了各种镀液的电化学稳定性,发现Cr~(3+):C_2O_4~(2-)为1:1的络合物镀液的光亮范围较大,且寿命长。
Experiments show that trivalent chromium and oxalate in the solution to a certain mix with this heating or at room temperature for a long time, can react to generate the corresponding complexes. In this paper, the concentrations of [Cr (C_2O_4) (H_2O) _4] ~, [Cr (C_2O_4) _2 (H_2O) _2] ~, [Cr C_2O_4) _3] ~ (3-). In addition, through the Hull cell test of different compounding bath and the analysis of Cr (Ⅵ) accumulation and bath life in continuous electroplating process, the electrochemical stability of various plating solutions was compared and found that Cr ~ (3 +): C_2O_4 ~ (2-) is 1: 1 complex plating bath has a bright range and long life.