Effect of Rare Earth Salt and Perpendicular Magnetic Field on Corrosion Resistance and Microstructure of CoMoP Film in Chloride Solution

• Published in: International journal of electrochemical science Vol. 7; no. 3; pp. 2188 - 2200
• Main Authors: Jiang, Li, Lu, Jianbiao, Pan, Shanshan, Yu, Yundan, Wei, Guoying, Ge, Hongliang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2012
• Subjects: CoMoP film; Corrosion; magnetic field; rare earth; rare earth; magnetic field; CoMoP film; Corrosion
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)13872-7

In order to improve the corrosion resistance of CoMoP film in 3.5% NaCl solution, rare earth(lanthanum) salt and perpendicular magnetic field(PMF) were adopted in the film deposition process. The corrosion of modified CoMoP film was studied using electrochemical techniques, and the microstructure of film was investigated using scanning electron microscopy(SEM), X-ray diffraction(XRD) and energy-dispersive X-ray spectroscopy(EDX). The results indicated that the introduction of La element in CoMoP film promoted the cathodic polarization of corrosion process, shifted the corrosion potentials to more negative values and decreased the corrosion current densities. Moreover, as the PMF intensity increased from 0.1T to 0.5T in the deposition process, the corrosion potential of CoMoP film in 3.5% NaCl solution showed a shifting towards positive values and the corrosion current density decreased. The addition of La salt or introduction of PMF in the deposition process can refine the grains of film and make surface more compact.