Abstract: ［Objective］To improve painting efficiency and cut costs，while meeting the higherrequirements for dry film thickness of waterborne epoxy coatings in a single application within the steelstructure coating industry.［Methods］ Through the screening of waterborne epoxy curing agents， waterborne epoxy emulsions，and rheological additives，a high-build waterborne epoxy mica iron oxide（MIO） intermediate coating was developed. The study focused on the evaluation of the coating's sagging resistance，neutral salt spray test，pull-off adhesion，and continuous condensation test. Additionally，the water evaporation rate under different temperatures and wet film thicknesses wasmeasured via the mass loss method to determine the optimal application conditions.［Results］The optimized coating demonstrates exceptional application properties：sagging resistance of 425 μm（wet film，one coat），2 280 h neutral salt spray test，7 MPa pull-off adhesion，and 504 h continuous condensation test，meeting industrial requirements for heavy-duty corrosion protection.［Conclusion］ The composite coating system met all requirements for atmospheric corrosion category C4（H） as specified in the Chinese industrial standard HG/T 5176—2017（Water-based anticorrosive coatings for steel structures）. This work provides a reliable solution for industrial applications of high-performance waterborne epoxy intermediate coatings.

Key words: waterborne epoxy coating, intermediate coatings, neutral salt spray test, continuous condensation test

摘要： 【目的】提高涂装效率、节省涂装成本，满足钢结构涂装行业对水性环氧涂料一次施工干膜厚度的更高要求。【方法】通过对水性环氧固化剂、水性环氧乳液和流变助剂的筛选，制备了一种厚浆型水性环氧云铁中间漆，重点考察了涂层抗流挂性、耐中性盐雾性、拉开法附着力和连续冷凝试验，并用失质量法测试了不同温度和湿膜厚度下水分挥发率以获得最佳涂装环境条件。【结果】研制的水性环氧云铁中间漆一次施工湿膜流挂膜厚达 425 μm，配套涂层耐中性盐雾 2 280 h，拉开法附着力达到 7 MPa，连续冷凝试验 504 h。【结论】配套涂层的性能达到 HG/T 5176—2017《钢结构用水性防腐涂料》大气腐蚀等级 C4（H）的要求，为高性能水性环氧中间漆的工业化应用提供了可靠的解决方案。

关键词: 水性环氧, 中间漆, 中性盐雾, 连续冷凝

CLC Number: 

• TQ635. 2