CORROSION-PROTECTION AGENT AND METHOD FOR CURRENT-FREE APPLICATION THEREOF

摘要

The invention relates to an aqueous corrosion-protection agent for metal substrates with a pH value of between 1 and 5, characterised in comprising a. at least one compound with a lanthanide metal as cation and/or a d-element metal with the exception of chromium as cation and/or a d-element metallate with the exception of chromium metallates as anion and b. at least one acid with oxidative properties with exception of phosphorus-containing and/or chromium-containing acids. The invention further relates to a method for coating of substrates with said aqueous corrosion protection agent.