This specification specifies the requirements for anti-corrosion coatings for ship steel fasteners, mass assurance regulations, delivery preparation, etc. It is suitable for steel fasteners with thread specifications not less than M6 on ships, covering the preparation and acceptance of organically modified zinc-aluminum coatings and multi-alloy organically modified zinc-aluminum composite coatings. Reference documents include GB/T 90.2, GB/T 3098.1, GB/T 3098.2, GB/T 4956, GB/T 5270-2005, GB/T 10125. Appearance of the coating is silver gray, continuous defect-free, the average thickness of the organic modified zinc-aluminum coating is not less than 8 μm, the minimum thickness is not less than 5 μm; the average thickness of the multi-alloy organic modified zinc-aluminum composite coating is not less than 15 μm, the minimum thickness is not less than 10 μm. Adhesion strength requires that the intermediate coating layer should not be flaking or exposed in the tape test.