Abstract
A study was conducted on the effect of base metals on the corrosion resistance of steel sheet coated with PVC using polyester adhesives. To examine the corrosion behavior at the adhesive/base metal interface, AC impedance measurements were made on steel sheets coated with adhesive only, when immersed in 5%NaCl. Base metals investigated were Zn and Zn-Co-Mo electroplated steel sheets and hot-dipped Zn, Zn-5%Al and Zn-55%Al plated steel sheets. The film resistance and corrosion resistance of the adhesives were affected by the plating of base metal, with Zn-Co-Mo plating showing superior corrosion resistance to Zn plating. In the cace of hot-dip plating, steel sheets plated with alloys containing Al showed excellent corrosion resistance. It was considered that the corrosion products, such as Co, Mo and Al compounds, under the adhesives affected the film resistance of adhesives measured by the AC impedance method and corrosion resistance.
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