We have some carbon steel parts which need to be protected from corrosion. The part has internal threaded section about and inch in diameter. The parts are to be installed under the car and will be exposed to contaiminates. We are looking for the best and cost effective way to protect the part from corrosion. One way is to apply zinc phospate to prime the part than apply paint on top. The zinc phospate provides corrosion protection for everywhere(e.g. thread) where paint cannot reach. From internet search, some site mentioned this coating forms abrasive crystalline. My concerns is if zinc phospate is applicability to bolted joint. Would the friction and abrasive characteristic damage the threaded joint. Would structural integrity (e.g. preload) be maintained with the crystal structure damaged? If oil is needed to lub the joint, would it be compatible with thread locking compound, e.g. Loctite 243.
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