Uniform Corrosion

Corrosion Hues on a Weathering Steel

Weathering Steel Corrosion Chemistry

Weathering steel or high strength low alloy (HSLA) steel has the unique characteristic that as it corrodes under proper conditions, it forms a dense and tightly adherent oxide barrier that seals out the atmosphere and retards further corrosion. This is in contrast to other steels that, as they corrode, they form a coarse, porous and flaky oxide that allows the atmosphere to continue penetrating the steel. Although cleaning and handling of the material can affect the short term appearance of the product, the overall corrosion resistance and ultimate appearance of weathering steel is not affected by cleanliness.

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