"QJ 498A-2006 Technical Requirements for Hard Chromium Platings for Hydraulic Cylinders" stipulates the technical requirements for hard chromium platings for hydraulic cylinders and similar parts, including mass inspection, mass assurance, handling of non-conforming products, Encasement, storage and transportation. It is applicable to mass inspection and acceptance of hydraulic cylinders and similar parts of aerospace products, and Miscellaneous products can also be referred to for implementation. The standard cites a number of relevant documents, such as metal plating and chemical treatment terminology, technical requirements for quality control before plating, bonding strength of plating layer and porosity test method, etc., to ensure that hard chromium platings meet the standard requirements and have good function and durability.