IN718 superalloy is one of the most reliable materials under the working conditions of deep-sea submarine oil and gas extraction equipment. However

corrosion failure is the main cause of failure of superalloy parts. Therefore

the development of long-term anti-corrosion and life extension technology on the surface of superalloy has important value. In this paper

mechanical impact on the surface of the part is proposed to achieve long-term corrosion resistance and life extension on the surface of the superalloy. Result shows that Machine Hammer Penning (MHP) significantly improves the anti-corrosion performance of the alloy by decreasing surface roughness and increasing residual compressive stress. However

with the increase of the number of impacts

the anti-corrosion performance of the alloy surface shows an obvious decline trend. The process has high controllability and flexibility

providing a solid theoretical basis for using MHP technology to improve the service life of deep-sea oil and gas extraction equipment.