CONDUCTIVE ORGANIC COATINGS

摘要

Conductive and weldable anti-corrosive compositions based on (blocked) polyurethane resins. epoxy resins, together with curing agents containing nitrogen and conductive extenders are suitable for coating metal surfaces, in particular sheet steel in the coil coating process. These compositions are distinguished by a low stoving temperature, a distinct reduction in white rust on galvanised sheet steel in the salt spray test and by an improvement in th e adhesion of the organic coating on the metallic substrate. These coatings furthermore also achieve adequate corrosion protection with a thin chromium coating, preferably also in Cr-fre e pretreatment processes. Sheet metal coated in this manner may be spot welded using any conventional processes.