Anti-corrosion treatment for stud surfaces
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There is an existing pressure vessel filled with phosphorus pentafluoride; the equipment is made of 316L material, featuring a large flange that is a grade 3 forged part, and studs made of 35CrMoA. The client requires surface treatment of the steel nuts and studs that are not resistant to corrosion, in order to prevent any corrosion. I would like to ask everyone, what surface treatment method should be used? Can chrome plating be used?
Apply blackening treatment, or spread butter.
One could combine the methods suggested by the two people above – using highly toxic substances – or maybe switch to bolts that are resistant to corrosion?
There are Teflon-coated bolts; you might want to take a look at them: lol
Replacing them with titanium alloy screws provides better corrosion resistance
Won’t the increased thickness from chromium plating and fluorine coating affect the fit of the bolts?
The cost is too high; it’s a bit too luxurious
Blackening or phosphating provides moderate corrosion resistance; it has little impact on assembly. Fluoroplastics offer good corrosion resistance, but they are too smooth, which may lead to degradation. Some manufacturers allow the use of galvanizing, though I don’t understand this either
Applying butter is the most direct method – simple, straightforward, and highly effective: lol