How to clean rust spots on stainless steel seamless elbows?
To clean the rust spots on seamless stainless steel elbows, it is necessary to first determine the type of rust spot, whether it is floating rust, oxide scale, or localized corrosion, and then choose the corresponding method to avoid damaging the passivation film on the surface of the stainless steel.
Mild floating rust (surface dust+slight oxidation) can be wiped with a soft cloth dipped in water or neutral detergent (dishwashing detergent). For stubborn areas, a small amount of white vinegar (weakly acidic, does not damage the passivation film) can be added. After wiping clean, rinse with water and finally apply a thin layer of edible oil or stainless steel maintenance agent to prevent rusting again.
Moderate rust (oxide scale or slight corrosion) should be lightly sanded along the bend pattern with fine sandpaper of 400 mesh or more or stainless steel special steel wire balls (avoiding circular grinding to prevent scratches). After removing the rust points, rinse with clean water and apply passivation paste (such as citric acid passivation paste) for 10-15 minutes to form a new passivation film. Finally, rinse and dry.
Stubborn rust spots (localized pitting) should first be treated with a small amount of stainless steel rust remover (selective or weakly acidic, avoid using strong corrosive agents such as hydrochloric acid), and left to stand for 5-8 minutes (do not soak for a long time). After the rust spot softens, it should be lightly ground with fine sandpaper and subsequently passivated.
During operation, do not use wire brushes (rough and hard, which can easily scratch the stainless steel surface), strong acid and alkali cleaners (such as toilet cleaner and caustic soda). After cleaning, be sure to dry off the water (especially at the bends and gaps, to avoid residual water causing secondary corrosion). If rust spots repeatedly appear, check the usage environment (whether it has been in contact with salt water or acid and alkali mist for a long time), and if necessary, perform external surface anti-corrosion treatment.
How to clean rust spots on stainless steel seamless elbows?
To clean the rust spots on seamless stainless steel elbows, it is necessary to first determine the type of rust spot, whether it is floating rust, oxide scale, or localized corrosion, and then choose the corresponding method to avoid damaging the passivation film on the surface of the stainless steel.
Mild floating rust (surface dust+slight oxidation) can be wiped with a soft cloth dipped in water or neutral detergent (dishwashing detergent). For stubborn areas, a small amount of white vinegar (weakly acidic, does not damage the passivation film) can be added. After wiping clean, rinse with water and finally apply a thin layer of edible oil or stainless steel maintenance agent to prevent rusting again.
Moderate rust (oxide scale or slight corrosion) should be lightly sanded along the bend pattern with fine sandpaper of 400 mesh or more or stainless steel special steel wire balls (avoiding circular grinding to prevent scratches). After removing the rust points, rinse with clean water and apply passivation paste (such as citric acid passivation paste) for 10-15 minutes to form a new passivation film. Finally, rinse and dry.
Stubborn rust spots (localized pitting) should first be treated with a small amount of stainless steel rust remover (selective or weakly acidic, avoid using strong corrosive agents such as hydrochloric acid), and left to stand for 5-8 minutes (do not soak for a long time). After the rust spot softens, it should be lightly ground with fine sandpaper and subsequently passivated.
During operation, do not use wire brushes (rough and hard, which can easily scratch the stainless steel surface), strong acid and alkali cleaners (such as toilet cleaner and caustic soda). After cleaning, be sure to dry off the water (especially at the bends and gaps, to avoid residual water causing secondary corrosion). If rust spots repeatedly appear, check the usage environment (whether it has been in contact with salt water or acid and alkali mist for a long time), and if necessary, perform external surface anti-corrosion treatment.