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ISMAIL HAKKI KARAHAN1,*
The effects of pH of an sulphate bath on the quality of Zn-Co coatings formed on AISI 4140 stainless steel by using the potentiostatic polarization technique at E = -3 V was investigated in order to improve uniformity and corrosion protection performance of the coating films. It was found that the uniformity and corrosion resistance of coating films deposited by potentiostatic polarization were closely associated with pH of the coating electrolyte. The pH to obtain the best coating film were investigated as a function of corrosion protection performance evaluated by curves of potentiodynamic anodic polarization conducted in NaCl 3% solution. Scanning electron microscope observation and electrochemical corrosion tests of the ZnCo samples confirmed significant improvement in uniformity and corrosion resistivity of coating films deposited by the potentiostatic technique by modifying the pH of the coating bath. It was also found that uniformity and corrosion resistivity of the coating films were firstly improved towards to pH=3 and then decreased with increasing pH values of the coating bath.
Electrodeposition, Zn–Co alloy, Corrosion, Electrolyte pH, X-Ray Diffraction.
ISMAIL HAKKI KARAHAN, Effect of pH on the deposition properties of electrodeposited Zn-Co coatings formed by potentiostatic technique on AISI 4140 stainless steel, Optoelectronics and Advanced Materials - Rapid Communications, 2, 12, December 2008, pp.828-832 (2008).
Submitted at: Oct. 31, 2008
Accepted at: Dec. 4, 2008
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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