Does chromium affect weathering steels?

However, the study of the influence of chromium on the initial stages of the atmospheric corrosion of weathering steels by Kamimura and Stratmann 21 found that the positive effect of chromium is not only not apparent in saline environments but also seems to be even harmful by accelerating weathering steels corrosion in coastal environments.

Does Cu improve the corrosion resistance of weathering steel?

Several studies 17, 18, 19, 20, 21 found that Cu can enhance the stability of the rust layer when used together with Cr, thus improving the corrosion resistance of weathering steel. However, a minimum of 0.10 wt% Cu is required in order to significantly improve the corrosion resistance of the steel 22.

Can Cr & Cu alloys improve rust layer stability of weathering steel?

The recent researches have suggested that addition of Cr, Cu, or P alloying elements can significantly improve the rust layer structure stability of the weathering steel, thereby improving its applicability in severe industrial and marine environments 9, 10, 11, 12, 13, 14, 15.

Why is rust a major factor affecting the corrosion resistance of steel?

This is mainly due to the gradual formation of the rust layer on the steel surface during the prolonged experiment time, where the main factor that affects the corrosion resistance has shifted from the corrosion resistance of the steel substrate to the density of the rust layer.

Why does black rust increase at 72 and 120 H?

At 72 and 120 h, surface corrosion of the samples became more extensive, and the proportion of Fe 3 O 4 is detectably higher, which is consistent with the increase in the black rust amount, as evidenced by the macroscopic morphology results (Supplementary Fig. 1).