HCD法によるTiNコーティング鋼の耐孔食, 耐すきま腐食性

概要

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TiN films were variously deposited onto SUS 304 stainless steel by an ion plating process using hollow cothode discharge (HCD). The pitting and crevice corrosion resistance of the TiN-coated specimens was estimated in chloride solutions, mainly by the electro-chemical method. The results obtained are as follows; The effects on corrosion resisitance of a TiC coating under the TiN film and of the temperatuer of deposition were not clear, but the effect of a Ti undercoating was evident. Corrosion morphology was also affected by Ti undercoating.In specimens without Ti undercoating, the pitting and crevice corrosion resistance was decreased by TiN coating, whereas with Ti undercoating the pitting potential and starting potential to crevice corrosion became more noble. Accordingly the pitting and crevice corrosion resistance was improved by TiN coating, but the repassivation potential became less nobel and repassivation was restrained as corrosion started.
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