Study of corrosion behavior on the addition of sodium citrate in nickel electroplating on SPCC steel using EIS

• Published in: IOP conference series. Materials Science and Engineering 2018-04, Vol.348 (1), p.12010
• Main Authors: Riastuti, R, Ramadini, C, Siallagan, S T, Rifki, A, Herdino, F
• Format: Article
• Language: English
• Subjects: Atomic force microscopes; Atomic force microscopy; Cold-rolled steel; Corrosion effects; Corrosion resistance; Corrosion resistant steels; Corrosion tests; Direct current; Electrochemical impedance spectroscopy; Electroplating; Grain refinement; Grain size; Linear polarization; Nickel; Operating temperature; Optical microscopes; Plating; Sodium; Sodium citrate; Wetting; Wetting agents
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/348/1/012010

The addition of sodium citrate to nickel electroplating process as additive is useful for refining the grain size of nickel deposit. The refining of grain size in nickel deposit as coating layer can improve surface performance, one of which corrosion resistance. This paper aims to investigate the effect of sodium citrate addition as grain refiner to promote corrosion resistance on SPCC steel. This experiment used Watt's Bath solution of NiSO4 300 g/L, NiCl4 45 g/L, H3BO3 60 g/L, wetting agent 0.2 cc/L. Sodium citrate was added in composition of 45g/L and 60g/L. Nickel were deposited by direct current using current density on 6 A/dm2 at the acidity level of 5 for 30 minutes by keeping the operating temperature stable at 50°C. The grain size of nickel deposit was observed through Optical Microscope and Atomic Force Microscope (AFM). The corrosion behavior of SPCC was observed by linear polarization and Electrochemical Impedance Spectroscopy (EIS) methods using 3% NaCl solution. Based on the research, the addition of sodium citrate as grain refiner will increasing corrosion resistance on SPCC steel from 0.35 to 0.05 mm/year.