本文论述了硬镀铬钢件进行磁粉检测的必要性和新产品试制中向我们提出来的检验问题。通过理论分析和试验证实:采取某些适当的措施,可以将航标规定的铬复盖层厚度从15微米,扩大到40微米,并且给出了进行磁粉检测的经验规范和方法。 This article discusses the necessity of magnetic powder testing of hard-chrome-plated steel parts and the test questions raised to us during trial production of new products. Through theoretical analysis and experiments, it is confirmed that some appropriate measures can be used to expand the thickness of chrome cap layer from 15 μm to 40 μm according to the requirements of aids to navigation and provide empirical norms and methods for magnetic particle testing.