Why is the slotted pan head screw severely corroded?

few days ago, when turning things over, I found that the slotted head pan screw on one of the accessories was severely corroded. I needed to replace it with a new one. Why is the slotted pan head screw corroded?

Generally speaking, it is necessary to look at the position where the slotted pan head screw is placed. If this position is frequently exposed to salt water, acid and alkali chemicals, the surface protective film of the screw will be damaged, and the screw will be corroded after the protective film is broken. So we will see what we see.

How to avoid this situation? Before producing slotted pan head screw, you can tell the manufacturer how many hours of salt spray test it is to withstand. For example, a 500-hour salt spray test is required. It is generally passivated using stainless steel. Or use titanium screws, the screws produced by titanium are very resistant to corrosion. Secondly, the slotted pan head screws should be kept away from the places where they can be exposed to acids and alkalis.

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