关键词: SPHC 钢；汽车动态工况；环境仓；腐蚀行为

Abstract: In this paper, the corrosion rate of steel plate heat-commercial (SPHC) steel after running in temperature and humidity in the dynamic driving process of a car is analyzed by scanning electron microscopy (SEM), and the microscopic morphology of the rust layer of SPHC steel after 7 days, 11 days and 15 days of testing is used to initially explore the corrosion change rule of SPHC steel under specific working conditions. The results show that the corrosion rate of SPHC steel spraies with 3% NaCl per day is higher than that of 0.5% NaCl under simulated vehicle dynamic conditions, but the corrosion rate of both steel shows the same trend of nonlinear change with the test time. When the test time is from 1 to 7 days, the corrosion rate first increases sharply, and the surface and middle of rust layer have a large number of cracks, which is the initial accelerated corrosion at this time. When the test time reached 11 days, the corrosion rate drops to the low point, and the rust layer is relatively dense, which enhanced the corrosion resistance of SPHC steel. When the test time reached 15 days, the corrosion rate rises the high point again. At this time, the rust layer peels off, the matrix is severely corroded, and the corrosion resistance is the worst.

Key words: SPHC steel; Automobile dynamic conditions; Environment warehouse; Corrosion behavior