All metals and reaction of oxygen in the atmosphere, the surface oxide film. Unfortunately, in the iron oxide formed on carbon steel proceed oxidation, corrosion continues to expand, forming holes. You can use paint or oxidation-resistant metal (eg, zinc, nickel and chromium) plating to ensure the steel surface, but, as people know, this protection is only a film. If the protective layer is damaged, the following steel began to rust.
Large diameter spiral steel pipe corrosion resistance depends on corrosion, coal tar epoxy anticorrosive is one of the components, so the protection methods vary. Strengthen the anti-corrosion paint material reaches level, large diameter spiral pipe atmospheric corrosion resistance can significantly increase, but higher strength corrosion, although still improve corrosion resistance, but not obvious. The reason is used for large diameter spiral steel pipe anti-corrosion processing of the processing, the change in the type of surface oxide became similar to the large diameter spiral pipe is formed on the surface of the metal oxide. This tight adhesion of large diameter spiral pipe oxide protective surface to prevent further oxidation. This oxide layer is very thin, it can be seen through the large diameter spiral steel pipe surface natural luster, making large-diameter spiral pipe has a unique surface. Moreover, if the surface is damaged, the exposed surface of large diameter spiral pipe and atmospheric reaction to self-repair, re-formation of this oxide "passive film" and continue to play a protective role. Therefore, all of the large diameter spiral pipe elements have a common characteristic, corrosion prevention of corrosion is the best way.
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