EFFECT OF UREA IN THE ELECTROLESS BATH ON THE PLATING RATE, PHOSPHORUS CONTENT AND CORROSION RESISTANCE OF THE Ni–P DEPOSITS

Tingting Li, Yulu Li, Qiongyu Zhou, Shaobo Zhou, Xiaomin Chen, Ying Wei, Guoguo Cai, Jibo Jiang and Sheng Han
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Tingting Li: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, P. R. China
Yulu Li: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, P. R. China
Qiongyu Zhou: ��Nanchang Institute of Technology, 901 Hero Avenue, Qingshan Lake District, Nanchang, Jiangxi 330044, P. R. China
Shaobo Zhou: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, P. R. China
Xiaomin Chen: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, P. R. China
Ying Wei: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, P. R. China
Guoguo Cai: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, P. R. China
Jibo Jiang: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, P. R. China
Sheng Han: School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, P. R. China

Surface Review and Letters (SRL), 2022, vol. 29, issue 12, 1-7

Abstract: Proper selection of bath additives is critical to the plating rate, phosphorus content and corrosion resistance of the nickel–phosphorus (Ni–P) alloy deposits. In this work, electroless Ni–P alloy deposition from an acidic bath using sodium hypophosphite as the reducing agent at relatively low temperatures (30°C and 60°C) was carried out in the presence and absence of urea additives. The effects of different concentrations of urea on plating rate and phosphorus content of the Ni–P deposits were studied. The results showed that the plating rate and the phosphorus content of the Ni–P deposits were largely dependent on the concentration of urea in the bath. The corrosion resistance of the Ni–P deposits was evaluated in aerated 3.5 wt.% sodium chloride (NaCl) solution using potentiodynamic polarization curves. It was found that the corrosion resistance of the deposits obtained from the bath solution containing 1 g/L of urea was the highest. In addition, cyclic voltammetry techniques were used to study the mechanism of electroless Ni–P alloy deposition in the bath. The results revealed that the addition of urea to the bath promoted the concentrations of adsorbed atomic hydrogen and sodium hypophosphite on mild steel surface, which markedly increased the phosphorus content of the Ni–P deposits. This work offers a new way that highlights the relation between the urea additives and phosphorus content.

Keywords: Corrosion resistance; cyclic voltammetry; electroless coating; phosphorus content (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X22501591

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