| DING Yao,LUO Xue-fang,LIU Ding-fu.Preparation of Additives for Electrodeposited Ni-W-B Alloy Coatings Based on Box-Behnken Experimental Design[J],51(12):178-187, 216 |
| Preparation of Additives for Electrodeposited Ni-W-B Alloy Coatings Based on Box-Behnken Experimental Design |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.12.018 |
| KeyWord:Ni-W-B alloy Box-Behnken test additive sodium dodecyl benzene sulfonate sodium saccharin 2-butyne-1,4- diol sodium allylsulfonate |
| Author | Institution |
| DING Yao |
College of Chemistry and Chemical Engineering, Guizhou University, Guiyang , China |
| LUO Xue-fang |
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: |
| Electrodeposited Ni-W-B alloy coating is considered to be a good substitute for chromium coating because of its high hardness and strong corrosion resistance. However, under the condition of basic bath, the cathode hydrogen evolution phenomenon is serious, which further limits the performance of the coating. Moreover, the coating produced is matte silver- white, without metallic luster, and lacks industrial aesthetics. The purpose of this experiment is to prepare an additive that can improve the properties (hardness, glossiness and corrosion resistance) of electrodeposited Ni-W-B alloy. Firstly, on the basis of the composition and technological conditions of the basic plating solution, the type and rough concentration range of additives were screened preliminarily by single factor test (Basic plating solution composition:Nickel sulfate 30 g/L, sodium tungstate 65 g/L, dimethylamine borane 10 g/L, ammonium citrate 100 g/L; Process conditions:pH=7.0, current density 8 A/dm2, temperature 60 ℃, electroplating time 60 min). The surfactant was selected as sodium dodecyl benzene sulfonate (SDBS) by single factor test, and the concentration range of sodium saccharin in brightener was 0.2-0.8 g/L、the concentration range of sodium allylsulfonate was 0.1-0.5 g/L and the concentration range of 2-Butyne-1,4-diol was 0.1-0.3 g/L. Secondly, on the basis of single factor test, Box-Behnken test with four factors and three levels was designed. The coating hardness was taken as the response value to study the influence rule of each additive on the coating hardness, and the optimal additive combination was obtained. With the hardness of the coating as the response value, the influence of each additive on the hardness of the coating was studied, and the optimal combination of additives was obtained. Finally, the Ni-W-B alloy coating sample was prepared with the addition of the best compound additive, and The effects of additives on glossiness, hardness and corrosion resistance of coatings were studied by gloss meter, Vickers hardness tester and electrochemical workstation. SEM and EDS were used to study the effects of additives on the surface morphology and composition of the coatings. Box-Behnken test showed that the optimal additive combination was as follows:SDBS concentration is 0.3 g/L, saccharin sodium concentration is 0.5 g/L, sodium allylsulfonate concentration is 0.24 g/L, 2-Butyne-1,4-diol concentration is 0.1 g/L. The coating hardness is 499.1HV0.5 and glossiness is 230 GU under the condition of compound additive plating solution. Compared with the coating hardness without additives, the coating hardness is increased by 41.6HV0.5 and gloss is increased by 85 GU. Tafel polarization curve analysis and AC impedance analysis of the additive on the corrosion resistance of the coating, the addition of additives can improve the corrosion resistance of the coating. According to SEM and EDS analysis results, the addition of additives makes the coating elements evenly distributed, the surface of the coating is more compact and smooth, which improves the surface morphology of the coating and promotes the deposition of boron. The content of each component in the coating is Ni 58.79%, W 38.93%, B 2.28%. In general, the addition of compound additives can significantly improve the properties of Ni-W-B alloy coatings, improve the surface morphology of coatings, and the prepared Ni-W-B alloy coatings emit metallic luster similar to stainless steel, can meet the needs of industry. |
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