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The coating process is a key link in the production of tinplate cans. Whether it is the inner coating or the outer coating, it must be ensured to be uniform, complete and crack-free. If there are any defects in the coating, the metal may be directly exposed, increasing the risk of food contamination.

Food packaging cans have very strict requirements on materials, especially their corrosion resistance and food contact safety. Acidic or alkaline components in food may cause corrosion to the metal surface, while the surface of tinplate after electrolytic treatment has stronger chemical corrosion resistance, which can effectively prevent direct contact between food and metal.

For example, the packaging of acidic food cans such as jam and ketchup often requires thicker tinplate to resist the erosion of acidic components. Generally speaking, the thickness of tinplate for such food packaging cans is about 0.20 mm to 0.30 mm.

The coating finish of electrolytic tinplate is high, and the surface of the tin layer after electrolysis treatment is smoother and brighter, which is conducive to subsequent printing, spraying and other fine processing. The tin layer of non-electrolytic tinplate is relatively thick and is usually not suitable for detailed processing.

The following are common steps for cleaning tinplate cans: 1. Prepare materials 2. Soak and decontaminate 3. Gently scrub 4. Rinse clean 5. Dry and store