Abstract
A laboratory study has been made of the interactions of unstressed AISI 304L stainless steel with zinc and zinc oxide in air, carbon monoxide or argon-hydrogen. Erosion or penetration ranging from 0.003 to 1.7 mm was produced by molten zinc in 1 h at 500 to 850° C in air and argon-hydrogen. The penetration at 700 to 850° C formed mechanically detrimental structures such as cracked intermetallic layers, distorted and fissured interdiffusion zones and liquid channels. No penetration occurred in carbon monoxide atmospheres because of the deposition of a carbon barrier layer onto the steel surfaces. Similarly, thick oxide films could delay penetration. Zinc vapour and zinc oxide produced pitting of the steel surfaces, the attack by zinc oxide being the more severe.
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