## 1 Introduction
[10] carried out lathe experiments on a Ti-6 Al-4V alloy and found that corrosion resistance is related to the surface roughness; by reducing the surface roughness Rz and Ra by 11.9% and 5.5%, respectively, the corrosion resistance improved by 18.8%. [PERSON] et al. [11] carried out experiments to compare the corrosion resistance of an Al-Li 2A97 alloy after milling and polishing. The experimental results showed that the surface roughness caused by the milling process was unfavorable to the corrosion resistance of the alloy; still, the surface hardening caused by the milling process made the corrosion resistance of the Al-Li 2A97 alloy after the milling process better than that caused by polishing. [PERSON] et al. [12] used different processing methods to process stainless steel workpieces and studied the effective regulation of surface topography on the corrosion resistance after processing. The results showed that not only does the workpiece's surface roughness affect the workpiece's corrosion behavior, but the shape of the peaks and valleys formed on the workpiece surface also affects the corrosion resistance of the workpiece. [PERSON] et al. [13] studied the relationship between the surface roughness and corrosion rate of pure Mg and chose pure Mg samples with different initial roughness values to carry out corrosion experiments; the experimental results showed that the surface roughness had a significant effect on the corrosion rate of pure Mg, and the corrosion rate increased with the increase in surface roughness. Meanwhile, pitting corrosion was not observed, which indicates that surface roughness does not affect the pitting potential of Mg. [PERSON] et al. [14] carried out corrosion experiments on Ti specimens with different surface roughness, and the results showed that Ti specimens with different surface roughness have good corrosion resistance. However, corrosion resistance still decreased with the increase in surface roughness compared with a smooth surface, and the microrough surface has better corrosion resistance. [PERSON] et al. [15] compared the surface properties of the coated materials prepared using different additive processes, and the experiment results showed that due to the lower surface roughness of the coated material prepared using selective beam melting (SEBM), the prepared material has better corrosion resistance. The scholars mentioned above carried out corrosion experiments on different materials with different surface roughness and found that the corrosion resistance of the specimen increases as the surface roughness decreases. However, the corrosion resistance of the specimen decreases when the surface roughness is below a specific value. Meanwhile, many scholars have also studied the influence of specimens' surface residual stress on the corrosion resistance of different materials. [PERSON] et al. [16] measured and analyzed the residual tensile stress on the electrochemical corrosion behavior of 304 stainless steel and found that the higher the residual tensile stress in the workpiece, the higher the dislocation density, the higher the corrosion current, and the more severe the corrosion. [PERSON] et al. [17] studied the influence regulation of surface residual stress on the corrosion behavior of Al-Zn-Mg-Cu alloy plates under different predeformation conditions and found that the corrosion rate was accelerated when residual tensile stresses existed on the plate surface. Through experiments, [PERSON] et al. [18] found that under the effect of welding residual compressive stress, the surface atomic density of the metal was increased, offsetting the promoted effect of surface residual stress and increasing the corrosion resistance of the welding structure. [PERSON] et al. [19] designed experiments that evaluated the effect of welding residual stress on corrosion fatigue properties and discussed the effect of the regulation of welding residual stress on the corrosion pit growth. [PERSON] et al.