Why isn’t it allowed to touch a properly treated metal surface with bare hands?
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Why isn’t it allowed to touch a properly treated metal surface with bare hands? Hand sweat can cause metal to rust. Sweat is a colorless or pale yellow, salty-tasting liquid with a weakly acidic nature; its pH value is 5-6. In addition to salts of sodium, potassium, calcium, and magnesium, it also contains small amounts of organic acids such as urea, lactic acid, and citric acid. When sweat comes into contact with metal, it forms a layer of sweat film on the metal surface; this sweat film exerts an electrochemical effect on the metal, causing it to corrode. Sweating is inevitable; to prevent rusting caused by hand sweat, production and maintenance workers should wear gloves or finger covers, or use specialized tools to handle parts, and avoid touching the treated metal surfaces with their hands.
Hand sweat can cause rust on metal surfaces; therefore, properly treated metal surfaces must not be touched with bare hands. .
The original poster didn’t explain clearly; it’s possible that the surface of the metal after preliminary processing has burrs, and touching it with bare hands can easily cause scratches.