Fastener issues
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Do fasteners have to undergo anti-corrosion treatment before leaving the factory? Does it have to be galvanized?
Why! Not galvanized, coated with molybdenum disulfide or with dust cap
It can also be anti-corrosion by blackening or spraying PTFE.
Many fasteners are phosphated, probably to prevent rust.
The fasteners are coated with a layer of oil when used to prevent rust. There is very little galvanization when they leave the factory.
There are many methods of anti-corrosion treatment, such as immersion in anti-rust oil, electroplating, electrophoresis, blackening, phosphating, etc.
Chemical standards mention blackening or phosphating, but the outdoor effect is really not that good.
Anti-corrosion treatment should be done before leaving the factory. However, due to environmental factors on site and inadequate maintenance, in fact fasteners often begin to rust after being used for a period of time. Personally, I feel that applying a layer of butter on site can extend the use time.