This standard specifies in detail the test requirements for ship equipment components, materials and their protective layers under salt fog conditions, including severity grades, test procedures, test interruption treatment and conformity criteria, and provides relevant engineering guidelines. The standard applies to evaluating the resistance of equipment, components, materials and their protective layers to salt fog corrosion under atmospheric exposure conditions, as well as evaluating the mass and uniformity of metal protective layers. The test chamber requires the use of materials resistant to salt fog corrosion to ensure the accuracy and Reliability of test results. Not applicable to general corrosion test methods, specially formulated for ship equipment design. This guide highlights the scope of application, main content and test conditions of the standard, which helps to understand and apply to the actual marine equipment environment testing and quality control.