Corrosion resistance: Drop concentrated sulfuric acid on the ordinary color steel plate and the coated steel plate of Haimei Metal, and let it stand for 10 minutes to carry out the corrosion resistance test. No fading, swelling, discoloration and other changes.
Acid resistance: Immerse the ordinary color steel plate and the coated steel plate together in 99.5% acetic acid solution for 24 hours. There is no obvious change in the acid resistance test. The surface paint of the ordinary color steel plate is full of bubbles, and the surface of the coated steel plate has no obvious change.
Alkali resistance: Soak the ordinary color steel plate and the coated steel plate together in 10% sodium hydroxide NaOH solution for 24 hours. The alkali resistance test requires no obvious change. The ordinary color steel plate appears to fade, but the coated steel plate does not fade or swell. , discoloration and other changes.