What material mushroom head self tapping screws do not rust?

Many consumers, when buying a car, or a home appliance, a Taiwanese brain, an outdoor device, after a period of hot sun and rain, will find the exposed screw fasteners rusted Even the corrosion causes the screw to fail, so the screw is replaced. When the customer finds the screw fastener, he will also think about it; can you find a mushroom head self tapping screws that does not rust?

There are many factors that affect the service life of screws. Mushroom head self tapping screws are easy to rust. The main reason is to look at the rust resistance of materials. In the case of stainless steel screws, the reason why stainless steel screws can resist rust than carbon steel is that stainless steel contains chromium. It can form a protective film of chromium oxide on the surface of stainless steel screws, which can effectively isolate the contact between stainless steel and air. The oxygen in the air cannot enter the steel to produce a chemical reaction, thereby achieving the anti-rust effect.

Although carbon steel screws do not contain chromium, they can be galvanized to achieve rust prevention. For example, zinc plating can be tested by salt spray for 48 hours, and Dacromet surface treatment can be passed for 500 hours.

Titanium screws are not used for other treatments because of their superior performance. The materials themselves can be rust-proof, corrosion-resistant, high-temperature resistant, and low-temperature resistant. Therefore, titanium mushroom head self tapping screws are mostly used in military, underwater operation equipment, or offshore equipment.

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