Abstract
The high environmental impact of zinc hot dip galvanising has led to the investigation of zinc pack cementation as an alternative more environmentally friendly coating technique. The examination of the corrosion behaviour of the zinc pack coatings showed that the main corrosion products are Zn and Fe hydrated chlorides and oxides. However a stress corrosion mechanism controls the pack degradation, while the hot dip galvanised coatings under the same circumstances are mainly attacked through a mechanism of pitting corrosion. Nevertheless, in any case the corrosion resistance of the coatings seems to be the same, as microscopic measurements of the thickness variations showed.
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