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Abstract

Hot dipped aluminising (HDA) of a low carbon steel wire was carried out using different preheating temperatures and withdraw rates. In all cases, a coating layer was formed, composed of an intermetallic layer and an aluminium overlayer. For the best quality coating, a relationship between preheating temperature and withdraw rate of the steel wire from the aluminium bath was determined as T =- 0.31W² + 16.2W + 215. Coating thickness increased with withdraw rate, following a parabolic relationship. SEM-EDAX analysis revealed that the intermetallic layer consisted primarily of Fe₂Al₅. The effects of preheating temperature on coating quality, corrosion resistance, and mechanical properties of the coating were studied. It was proved that using a cooling system could partially eliminate the decrease in strength generated by the HDA process.

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Coating structure and properties of continuously hot dipped aluminised steel wire

Abstract

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