binders are those which contain a blocked polyurethane resin based on the more highly reactive aromatic polyisocyanates in particular mdi blended with a blocked polyurethane resin based on aliphatic polyisocyanates in particular idpi or tmxdi the anti corrosive composition additionally contains 0 to 30 wt of a solvent or solvent mixture wherein a proportion of this solvent or solvent mixture may already be introduced by the epoxy resin component or polyurethane resin component in particular if conventional commercial binder components are used for this purpose suitable solvents are any solvents conventional in the lacquer industry based on ketones such as methyl ethyl ketone methyl isobutyl ketone methyl n amyl ketone ethyl amyl ketone acetylacetone diacetone alcohol aromatic hydrocarbons such as toluene xylene or mixtures thereof may also be used as may aliphatic hydrocarbon mixtures having boiling points between about 80 and 180 u00b0 c further suitable solvents are for example esters such as ethyl acetate n butyl acetate isobutyl isobutyrate or alkoxyalkyl acetates such as methoxypropyl acetate or 2 ethoxyethyl acetate monofunctional alcohols such as isopropyl alcohol n butanol methyl isobutyl carbinol or 2 ethoxyethanol or monoalkyl ethers of ethylene glycol diethylene glycol or propylene glycol may also be mentioned as representatives of many suitable solvents it may be convenient to use mixtures of the above stated solvents the conductive and weldable anti corrosive composition furthermore contains finely divided conductive extenders in quantities of between 40 and 70 wt powdered zinc powdered aluminum graphite and or molybdenum disulfide carbon black iron phosphide or baso 4 doped with tin or antimony may be mentioned by way of example 0 to 15 wt of silicate based anti corrosive pigments may additionally be used such anti corrosive pigments are known and zinc calcium aluminum strontium polyphosphate silicate.