多功能水性低表面处理涂料及涂层防护性能

基于锈蚀碳钢表面,针对一种多功能型的酸性水性低表面处理涂料中主要防锈组分和配制工艺对涂料和涂层性能的影响进行研究,考察涂层的防护性能,并与同类进口涂层进行对比. 结果表明:在基材表面处理等级为St1时,涂层附着力随着防锈组分含量的增加均呈现先上升再下降的趋势,螯合剂所含活性基团稳定了基材表面锈蚀,带来涂层附着性能的提高. 复合锈转化剂将基材表面锈蚀络合转化,进一步提高涂层附着力. 最佳配制工艺为后加复合锈转化剂与低速搅拌相结合. 所得涂层在基材表面处理等级分别为St1和St3时附着性能无明显差异,附着力达5 MPa. 涂层耐蚀性能也无明显差异:耐盐水1200 h,耐盐雾1000 h,耐紫外老化2000 h,远高于进口同类水性带锈底漆,适合应用于大气环境中复杂钢铁构件的维护.

Multifunctional water-based surface tolerant coating and its protective performance

Based on carbon steel surface corrosion, a study was conducted on multifunction acid water-based surface tolerant coat-ings. The focus was placed on the effect of antirust components and preparation processes on the coating properties. The barrier prop-erty was evaluated and compared with imported counterparts. The results show that when the treatment level of the substrate material surface is St1, the adhesive force of the coatings rises at the beginning and then goes downward as the content of the antirust compo-nents keeps increasing. The chelating agent contains active groups which stabilize the substrate surface corrosion, resulting in the ad-hesion performance of the coatings increasing. The compound rust conversion agent improves the coating adhesive force further by translating the corroded substrate surface complexation. The best preparation process needs to mix at low speed and add the compound rust agent at the end of the steps. The adhesive forces of the coatings on the substrate material surfaces treated at St1 and St3 levels show no difference, and they are larger than 5 MPa. The corrosion resisting properties, resistant to salt water for 1200 h, salt spray for 1000 h and ultraviolet aging for 2000 h, are much higher than those of similar imported water-based rust primers. The coatings are suit-able for the maintenance of complex steel components in atmospheric environment.