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ELECTROCHEMICAL CORROSION BEHAVIOR OF 17-4PH STAINLESS STEEL WITH LASER SURFACE MELTING TREATMENT |
LI Zhong1,2, ZHANG Junwei1, MENG Guozhe2, SUN Feilong2, SHAO Yawei2, ZHANG Tao2 |
1. School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan 114051
2. School of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001 |
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Abstract The effects of laser parameters at a constant laser power (1600W) on the corrosion behavior of 17-4PH stainless steel were investigated in 3.5% NaCl solution by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) technique, combined with optical microscopy and scanning electron microscopy (SEM) observation. The results showed that sample A, which was treated by laser surface melting process with light-absorption X and scanning speed of 6 mm/s, possessed the highest corrosion resistance. The results also demonstrated that the homogeneous microstructure was obtained only when the light-absorption and the scanning speed matched well (such as the light-absorption X and scanning speed 6 mm/s), leading the enhancement of the corrosion resistance; otherwise the heterogeneous would be obtained (such as the light-alsorlant Y and scanning speed 6 mm/s), leading to the degradation of the corrosion resistance and the material would suffer serious pitting corrosion when it was used in the corrosive environment.
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Received: 08 April 2011
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Corresponding Authors:
MENG Guozhe
E-mail: mengguozhe@hrbeu.edu.cn
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