Primary anti-corrosive paint composition and steel plate with primary anti-corrosive paint film

摘要

Disclosed is a primary anti-corrosive paint composition comprising (a) a zinc dust, (b) an amorphous glass powder containing an alkali metal oxide as a compositional component, (c) a siloxane type coupling agent and (d) an organic solvent. Also disclosed is a steel plate with primary anti-corrosive paint film wherein a steel plate is coated with the primary anti-corrosive paint composition. The primary anti-corrosive paint composition is capable of forming a paint film which does not lower anti-corrosion properties and can inhibit occurrence of defects such as pits or blowholes even if welding is carried out at a high speed of not less than 100 cm/min.