The degradation of a zinc-rich epoxy primer/acrylic polyurethane coating system on carbon steel was studied in the simulated marine atmospheric solution (0.05% NaCl), industrial atmospheric solution (0.35% (NH₄)₂SO₄), and marine-industrial atmospheric solution (0.05% NaCl + 0.35% (NH₄)₂SO₄), by electrochemical impedance spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy methods. The influences of the soluble contaminants in the atmospheres, including chloride ions, sulfate ions, and ammonium ions, on the coating failure mechanism were compared and analyzed. The results showed that the degradation speed of the coating system in three simulated atmospheric solutions is in the following order: simulated marine atmosphere > simulated marine-industrial atmosphere > simulated industrial atmosphere. The degradation is mainly related to the permeation rate of the water through the coating. The aggressive ions, basic cations, and the property of the corrosion products also have influences on the degradation process. The alternating temperature environment (45°C 12 h + 25°C 12 h) could increase the degradation speed of the coating and the difference of the speed in the three solutions.

在模拟海洋大气溶液（0.05％NaCl），工业大气溶液（0.35％（NH ₄）₂ SO ₄）和海洋工业环境中研究了碳钢上富锌环氧底漆/丙烯酸聚氨酯涂料体系的降解。大气溶液（0.05％NaCl + 0.35％（NH ₄）₂ SO ₄），电化学阻抗谱，傅立叶变换红外光谱和扫描电子显微镜方法。比较并分析了大气中的可溶性污染物（包括氯离子，硫酸根离子和铵离子）对涂层破坏机理的影响。结果表明，在三种模拟大气溶液中，涂料体系的降解速度依次为：模拟海洋大气>模拟海洋工业大气>模拟工业大气。降解主要与水通过涂层的渗透率有关。侵蚀性离子，碱性阳离子和腐蚀产物的性质也会对降解过程产生影响。