Research of Corrosion Resistance of Laser Surface Remelting Stainless Steel Based on Orthogonal Design Method
X. Li, K Shao, X-Y. Wen and H. Lin
To further enhance the corrosion resistance of 304 stainless steel, laser surface remelting technology is used for surface treatment. Orthogonal optimization design methodology is used to optimize the parameters of laser surface remelting of 304 stainless steel. Analysis of variance and extreme variance based on L16(45) orthogonal experiments were used to obtain the effects of different parameters on the corrosion resistance of 304 stainless steel. The results show that the parameters affecting the corrosion resistance are as follows: laser repetition frequency > laser scanning spacing > laser spot diameter > laser scanning speed > laser power. The optimal parameters of orthogonal optimization are laser power 3 W, laser spot diameter 30 μm, laser repetition rate 70 kHz, laser scanning speed 40 mm·s-1 and laser scanning spacing 10 μm. The surface corrosion resistance of stainless steel prepared by laser surface remelting with optimized parameters is improved, and the self-corrosion current density is increased by 8.59% compared with that of the substrate. This paper reveals the influence of 5 laser parameters on the corrosion resistance of stainless steel, which provides a reference for further improving the corrosion resistance of 304 stainless steel.
Keywords: Laser surface remelting, 304 stainless steel, orthogonal optimization design, self-corrosion current density, corrosion resistance