Stainless steel seamless elbows rust when the protective film on the surface is damaged, causing oxidation reactions of iron elements in contact with air or corrosive substances.
There are many reasons for rusting, which may be buying counterfeit/inferior steel pipes, coming into contact with chloride ions, welding damage, surface scratches, or long-term exposure to humid and hot environments!
How to deal with rust urgently? Here are three steps to teach you:
Wear gloves during operation to avoid direct skin contact with chemicals! Take measures based on the rusting situation:
Mild macula: Wipe with neutral detergent and scouring pad in a smooth pattern, rinse with clean water. (Steel wire balls are prohibited to avoid scratching and aggravating rust)
Stubborn red rust: Wet apply white vinegar/lemon juice for 10 minutes, lightly grind with ultra-fine sandpaper (800 grit). (After polishing, rust remover should be used to neutralize residual acidity)
Blue and purple rust in welding area: professional stainless steel pickling solution immersion, high-pressure water flushing (industrial scenarios require shutdown operation to avoid the risk of medium mixing)
Even pure stainless steel seamless elbows are not always rust free, they mainly rely on chromium oxide film to prevent corrosion!