| YAO Zhu,LIU Ding-fu.Preparation of New TiN-Nickel-Copper Alloy Electroplating Additives Based on RSM-BBD[J],50(2):338-346 |
| Preparation of New TiN-Nickel-Copper Alloy Electroplating Additives Based on RSM-BBD |
| Received:September 30, 2020 Revised:January 10, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.02.036 |
| KeyWord:electroplate additives tin-nickel-copper alloy single factor response surface saccharin sodium 2-butyne-1,4-diol thiourea |
| Author | Institution |
| YAO Zhu |
College of Chemistry and Chemical Engineering, Guizhou University, Guiyang , China |
| LIU Ding-fu |
College of Chemistry and Chemical Engineering, Guizhou University, Guiyang , China |
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| Abstract: |
| The purpose is to prepare a copper-tin alloy electroplating additive, and use this additive to prepare a tin-nickel-copper alloy coating with bright black and good overall performance. The method adopted is that the basic composition of the plating solution:nickel chloride 33.28 g/L, tin chloride 29.33 g/L, copper sulfate 5 g/L, potassium pyrophosphate 265 g/L, L-cysteine 6 g/L, and ethylenediamine 20 mL/L, triammonium citrate 40 g/L. The process conditions are pH=8.5, temperature of 40 ℃, current density of 1.3 A/dm2, and plating time of 5 min. Based on the bath and the single factor test, the response surface method was used to design three factors (saccharin sodium, 1.4-butynediol and thiourea) and three levels test in response surface method with the 60° gloss of the coating as response value. Through regression analysis, law of effect of each component parameter of the electroplating solution on the response value was obtained, and the best formula of the electroplating additive was obtained through optimization analysis. The adhesion and surface hardness of the coating prepared with the best formula were analyzed by cross-cut tester and a Vickers hardness tester, the effect of additives on the corrosion resistance of tin-nickel-copper alloy coatings was studied by AC impedance method, and the surface morphology and composition were analyzed by SEM and EDS. According to the test analysis of response surface design, the optimal additive formula selected solution formula was as follows:0.4 g/L for 1.4-butynediol, 3.5 g/L for saccharin sodium and 0.06 g/L for thiourea. By adopting the additive formula, under the above-mentioned basic plating solution and process conditions, a smooth and bright gun black test piece can be obtained. The 60° glossiness of the coating reaches was 200 GU, the ISO grade of adhesion is 1, the ASTM grade is 4B, and the Vickers hardness is 280.56HV1.0. The electrochemical analysis shows that the coating has good corrosion resistance. In conclusion, the compound additive can prepare a flat and high gloss gun black coating, and the coating has good adhesion, with a significant improvement in hardness and corrosion resistance, which can meet industrial requirements. |
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