Anti-corrosion methods for steel embedments in fiberglass-reinforced plastic equipment
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What is the most suitable method for preventing corrosion of the steel inserts in fiberglass-reinforced plastic equipment, without affecting the adhesion between the steel plate and the fiberglass-reinforced plastic surface?
Just wrap it in fiberglass reinforced plastic for corrosion protection – fiberglass is originally a material used for that purpose.
Not all fiberglass-reinforced plastics are corrosion-resistant. Corrosion-resistant fiberglass-reinforced plastics generally require surface mats or chopped fibers as reinforcing materials, along with corrosion-resistant resins as binders； FRP made from coarse fabric and ordinary resin is not resistant to corrosion. When manufacturing the lugs, consideration must also be given to the corrosion resistance of the lugs as well as the adhesion strength between the lugs and the fiberglass-reinforced plastic.
Many things can probably be solved somehow. You are absolutely correct regarding the corrosion resistance of fiberglass-reinforced plastic. However, the lifting lugs on ordinary equipment are located on the outside, so the corrosion resistance requirements for such lugs are not high. If you use FRP for bonding, it can sometimes be very difficult to make it strong enough to support equipment. You might change the structure of the lifting lugs, for example by using clamps or lugs that extend out from inside the equipment, and apply anti-corrosion treatment to both the interior and exterior sides (since the equipment can be made of fiberglass, why shouldn’t anti-corrosion treatments for the fiberglass of the lifting lugs work as well?) ), isn’t that very simple?
It is not difficult to achieve adhesion between the steel lugs and fiberglass-reinforced plastic, but there are gaps between the fiberglass-reinforced plastic and the steel lugs. Once the equipment is in place, rainwater can flow into these gaps, causing the steel lugs to rust. The rust then flows out through those gaps. In chemical plants, the corrosive effects of rainwater and gases are quite severe.
The gap between the lifting lugs and the equipment can be filled with mortar, and then covered with fiberglass; in any case, the steel components are not left exposed after the lifting lugs are installed.
The connection points between the lifting lugs and other embedded components are definitely exposed
Then cover the exposed part with fiberglass!
The connection points between the lifting lugs and other embedded components are definitely exposed, for hanging hooks, connecting steel platforms or ladders, etc.
After polishing it clean, just apply two coats of vinyl ester resin. If necessary, it is also possible to wrap it with a layer of 0.2mm glass fiber cloth and then apply a topcoat.