## 5 Conclusions  
In this paper, we carried out an experimental study on the influence of the regulation of surface integrity on the degradation of material properties after electrolytic corrosion. The surface roughness and surface residual stress were chosen as the main surface integrity indexes, and the influence of the two indexes on the corrosion rate of surface material, surface roughness after corrosion, and variation in tensile mechanical properties were analyzed. The optimal mechanical processing parameters to improve the corrosion resistance of the material are proposed based on the regulations obtained from the experiments. The conclusions are as follows:  
1. For the specimens with different initial surface roughness, the corrosion rate of the specimens decreases, and the change rate of the corrosion rate first decreases and then increases with the decrease in surface roughness. Among them, the corrosion rate of specimens with a surface roughness of Ra \(3.012\)\(\upmu\)m decreases the most, which is about \(29.8\%\). During the corrosion process, the surface roughness of specimens first increases and then decreases; after \(3\) h of corrosion, the variation in specimen surface roughness and surface topography tends to be stable, and during this process, the surface roughness of specimen with a surface roughness of Ra \(3.012\)\(\upmu\)m changes significantly. After corrosion, the tensile strength of the tensile specimens with different surface roughness decreases, and the tensile strength of specimens first increases and then decreases with surface roughness. The specimen with a surface roughness of Ra \(0.168\)\(\upmu\)m has the largest tensile strength and extensibility, which are \(527.84\) MPa and \(19.8\%\), respectively, and this surface roughness specimen has the best corrosion resistance. During the production process, the best corrosion resistance could be obtained with the surface roughness of Ra \(0.168\)\(\upmu\)m by grinding;
2. The corrosion rate decreases in the specimens with different surface residual stress as the corrosion proceeds. Among them, the specimen with a surface residual stress of \(-335.64\) MPa has the largest corrosion rate, which is \(245.1\)\(\upmu\)m/a; after \(4\) h of corrosion, the corrosion rate of this specimen decreased by \(49.9\%\), which is the largest of four different specimens with different surface residual stress. As the surface residual stress increases, the surface roughness of specimens with different surface residual stress increases and then decreases as the corrosion proceeds. Among them, the surface roughness of the specimen with a surface residual stress of \(-120.2\) MPa does not change significantly, and the surface roughness of the other three specimens finally becomes stable at Ra \(4.7\)\(\upmu\)m. After corrosion, the tensile strength of specimens increases with the increase in surface residual stress. Meanwhile, the extensibility of specimens decreases with the increase in surface residual stress; the specimen with a surface residual stress of \(-335.84\) MPa has the largest tensile strength of the four specimens, which is 548.8 MPa, and this surface residual compressive stress specimen has the best corrosion resistance. During the production process, the process parameters of 0.5 mm steel pellets and 0.4 MPa shot peening pressure could be used to strengthen the surface of the workpiece to obtain the best corrosion resistance.  
[PERSON] and [PERSON] conceived the idea of this work. [PERSON], [PERSON] and [PERSON] conducted the shot peening experiment; data curation, [PERSON]; original draft preparation, [PERSON]; review and editing, [PERSON] and [PERSON]. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the National Key R&D Program of China, grant number 2020 YFA0714403.  
The data used to support the findings of this study are available from the corresponding author upon request.  
The authors declare no conflict of interest.