On March 10, 2026, technical guidelines for salt spray resistance test of waterborne coatings were officially released, defining two core types: Neutral Salt Spray Test (NSS) and Acetic Acid Salt Spray Test (AASS), providing a unified testing basis for the industry. NSS uses 5% sodium chloride solution with pH 6.5-7.2 at a constant temperature of 35℃, serving as a universal method for basic corrosion resistance evaluation of metal coatings, suitable for routine quality control. AASS accelerates corrosion rate by about three times via acidic environment, more applicable to high-demand scenarios such as automotive exterior parts and outdoor metal products. The testing process includes five steps: sample preparation, solution preparation, equipment calibration, test execution and result evaluation, strictly complying with international and domestic standards such as ASTM B117, ISO 9227 and GB/T 10125. Results focus on corrosion rating and phenomenon description, emphasizing blistering, peeling and rusting of coatings. As an accelerated simulation method, this test cannot accurately convert to natural service years, but provides critical references for process optimization and supplier comparison, promoting the standardized application of waterborne coatings in anti-corrosion fields.
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