Anticorrosion paint composition, anticorrosion method for magnesium alloy moldings using the composition, and coating moldings

摘要

PROBLEM TO BE SOLVED: To adhere a coating film to a metal even if an unexpected coating film defect occurs, while ensuring a barrier property of a factor that induces rust such as water and oxygen, particularly for a material made of magnesium alloy. An anticorrosive paint composition that can exhibit a sufficient anticorrosive effect that ensures properties and does not spread corrosion, and can dry and cure at room temperature even for large structural members such as high-speed transport vehicles, and has good coating workability. Provide things. An anticorrosion coating composition containing an epoxy resin and a curing agent, having a weight average molecular weight of 470 to 900 and an epoxy equivalent of 180 to 1,000 g / eq. It contains a bisphenol type epoxy resin (A-1), a polymer type epoxy resin (A-2) having a weight average molecular weight of 10,000 to 100,000, and an amine-based curing agent (B). The mass ratio of these (A-1) component and (A-2) component is (A-1) :( A-2) = 10: 90 to 90:10 in terms of solid content. It is a coating composition. [Selection diagram] None