Waterborne epoxy emulsions, featuring low VOC and environmental friendliness, have gradually replaced traditional solvent-based products in industrial anti-corrosion, flooring and chemical equipment coating industries. The acid and alkali resistance of paint films directly determines the service life of protective coatings. Recent industrial research shows that this core performance is jointly affected by multiple factors. Hydrophilic groups and residual emulsifiers will form tiny permeation channels inside the paint film, leading to coating failure such as peeling and blistering. Five decisive factors are concluded: molecular structure and epoxy equivalent of emulsions, matching degree of curing agents and crosslinking density, residual amount of emulsifiers, compatibility of pigments and fillers, as well as film-forming and curing processes. Adopting bisphenol A epoxy resin, original supporting curing agents and high-performance shielding fillers, together with standardized construction, can effectively enhance the compactness and anti-corrosion capacity of coatings. The industry emphasizes that overall control of formulas, materials and construction procedures is essential to realize the long-term protection of waterborne epoxy emulsions. https://www.tiktok.com/@mia_iota/video/7597717976720149782