Abstract
The results of accelerated corrosion tests (copper-accelerated acetic acid salt spray (CASS) test and Corrodkote) on eight systems of electrodeposited Ni/Cr and Cu/Ni/Cr coatings on steel are discussed. The systems of three-layer Cu/Ni/Cr coatings included conventional coatings (with regular chromium layers) and coatings with an external layer of microporous or microcracked chromium. Some systems were additionally electrochemically chromated. The two corrosion tests revealed distinct and essential differences in corrosion resistance between conventional coatings (with regular chromium layers) and coatings with microdiscontinuities, but it was not possible to distinguish between the particular systems of coatings with microdiscontinuities. When the required coating thicknesses are maintained in the range of thicknesses included in the discussed tests, all the coating systems with microdiscontinuities fulfil the requirements of the appropriate standard relating to the corrosion resistance for exceptionally severe service conditions.
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