ANSI B18.2.1 Material Selection for Bolt Mould
The non-metal coating refers to the maintenance layer formed on the surface of metal equipment or parts by organic polymer materials such as paint and inorganic materials such as ceramics, and non-standard anti-theft screws. The maintenance layer can completely isolate the base metal from the environment medium to avoid the corrosion of the base metal caused by contact corrosion on the...
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