What are the reasons for the rust of self-tapping screws

Update:09-02-2021
Summary:

Everyone is no stranger to self-tapping screws. They ar […]

Everyone is no stranger to self-tapping screws. They are more common on plastic parts. Generally, there is no need to drill holes and tap threads. They can be used on the material to be consolidated, relying on their own threads to consolidate the body. Tap-drill-squeeze-press out the corresponding thread to make it fit tightly. Some customers encountered the rust of self-tapping screws before. Next, Hangzhou Lizhan Hardware Co., Ltd. will talk to you about the causes of rust and how to improve it.

①Cause of rust:

1. Electroplating process problem. When the electroplating factory is electroplating self-tapping screws, the moisture is not dried, resulting in moisture residue. Or, after drying, condensed water is formed during packaging, which causes a chemical reaction and rust occurs. In addition, if the plating is poor, the plating layer is too thin, the scandium corrosion ability becomes weak, and rust will also appear.

2. Storage or use environmental problems, long-term storage or use under salinity, acidity, alkalinity, high temperature and humidity, over time, self-tapping screws will slowly be corroded, which will cause rust.

②How to improve

1. In terms of electroplating process, you should choose the electroplating color with a longer salt spray test time. The electroplating should be done well and the electroplating layer should not be too thin. And in order to further improve the anti-rust ability, you can consider spraying imitation rust paint.

2. In terms of storage environment, put the packaged self-tapping screws on the pallet or shelf without touching the bottom surface. The storage environment should not be too humid. It should be ventilated and breathable without too much moisture.

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