针对舰炮身管表面镀铬层出现剥落、散在无规则及深浅不均的锈坑现象，对舰炮身管表面锈蚀机理进行 研究。通过对样件锈蚀表面宏观形貌及微观腐蚀形貌观察，结合锈蚀坑分布规律统计分析，得出镀铬层的开裂剥落 是造成身管锈蚀的根本原因。实验结果表明：腐蚀介质抵达基体界面，形成锈蚀源，其中氯离子起到先锋作用；镀 铬层鼓泡以及蚀坑扩张时的铬层断裂，均为固支弯曲断裂模式。该研究可为舰炮身管表面防腐蚀及锈蚀修复方法提 供参考依据。
The mechanism of corrosion on the surface of the naval gun barrel was studied in view of the phenomenon that the chromium plating layer on the surface of the gun tube was peeled off, scattered in irregular and uneven depth. Through the macroscopic and microscopic corrosion morphology of the corroded surface of the sample and the statistical analysis of the distribution rules of the corroded pit, it is concluded that the cracking and peeling of the chrome-plated layer is the fundamental reason for the corrosion of the barrel. The experimental results show that the corrosion medium reaches the interface of matrix and forms corrosion source, in which chloride ion plays a pioneer role. The fracture of chromium layer during bubbling and expanding of corrosion pit is a fixed-branch bending fracture mode. This study can provide reference for the surface corrosion prevention and corrosion repair methods of naval gun.