The photos of the conical crusher liner before and after use taken at the workshop site are shown in Figure 1. Figure 1A shows that the liner surface is clean and the polished part is flat and bright before assembly. From figure 1b, it can be seen that the liner is obviously rusted after use, the overall surface is covered by rust, and there is a large amount of red rust on its inner surface, which can be proved, The lining plate of cone crusher will be affected and consumed by corrosion in the service process.
Based on the above considerations, the corrosion behavior of bainite Martian multiphase wear-resistant cast steel through four-dimensional wear analysis can help to understand the long-life mechanism of this material in the lining plate of cone crusher. In this paper, the salt spray experiment is taken as the starting point for the analysis of bainite Martian multiphase wear-resistant cast steel, and the multi-dimensional wear analysis theory is improved.
The macro photos of the samples after the salt spray test are given in Fig. 2. It can be seen from Fig. 2A that the original bright hanging piece lost its metallic luster after salt spray corrosion for 1h, and obvious grayish green and red rust appeared on the surface, which was mainly in point or block shape. The corrosion area was calculated by imagepro image processing software, and the results showed that the corrosion area accounted for 26.6% of the sample surface at this time. Fig. 2B shows that after 2 hours of salt spray corrosion, gray green and red rust increased significantly, the color deepened, and the spot and block rust on the morphology decreased, mostly in long strips. At this time, the corrosion area was 47.5%. As can be seen from figure 2c, when the salt spray corrosion time is extended to 4h, the rust is basically red rust, the spot and block rust disappear, and the corrosion coverage increases to 72.4%. For the sample after 8h salt spray corrosion in Fig. 2D, the red rust tends to be more dense, the thin strip rust is combined, and the final morphology is thick strips connected with each other. According to statistics, the corrosion area accounts for 79.5%. In Fig. 2E, after 24 hours of salt spray corrosion, the surface of the sample is basically covered by dense red rust, accounting for 98.8%. Fig. 2F is a macro photo of the impact abrasive wear sample. It can be seen that since the specific surface area is much lower than that of the coupon sample, the corrosion degree of the section of the impact abrasive wear sample by salt spray is slightly lower than that of the coupon sample under the same experimental conditions, but the change trend of the two is the same.
Corrosion rate is a key index used to characterize the corrosion rate of materials in salt spray test, which can be calculated by formula:
Where: ν Is the corrosion life, W0 is the mass of the sample before the salt spray test, WT is the mass of the sample after the salt spray test at different times, s is the exposed area of the sample surface, and t is the salt spray test time.