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《MATERIAIS PROTECTION》 1999-05
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Bright Black ZnNi Alloy Electroplating in basic Solution

Zhou Xiaorong,Li Huafeng,Liu Liming et al  
Abstract)A new bright black ZnNi alloy electroplating process with basic bath solution is introduced. The technological parameters are:ZnO 2 ̄12, NaOH 80 ̄120, NiSO46H2O 16 ̄25 glycine 4 ̄6 g/L;triethanolamine 50 ̄80,additive (WD 928) 8 ̄10 ml/L;temperature:30 ̄65 , cathodic current densities:0.5 ̄6.5 A/dm,anodes:Zn and Ni. From this electrolyte, a bright black and anticorrosive aloy deposits containing 1 ̄10 percent nickel content can be obtained. The results of corroding tests in 3% HCl solution and in 5% NaCl solution showed that the anticorrosive abilities of bright black ZnNi alloy deposit were four times as high as bright white ZnNi alloy deposit with same nickel content without passivating.
【CateGory Index】: TQ153.2
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