In daily life, stainless steel screws are common fasteners. In the process of use, rust is a common phenomenon and something that annoys us. This will not only affect the beauty, but also affect the performance of stainless steel screws.

Therefore, we must pay attention to the key points in the process of using stainless steel screws:

1. The surface of stainless steel screws is adhered with organic juice (such as melons and vegetables, noodle soup, phlegm, etc.), which constitutes organic acid in the case of water and oxygen. For a long time, the corrosion of organic acid on the metal surface will be reduced.

2. For the attachments of dust or dissimilar metal particles, in the humid air, the attachments and the condensate of stainless steel screws connect them into a micro battery, which leads to electrochemical reaction and damage to the protective film, which is called electrochemical corrosion.

3. In polluted air (such as atmosphere containing a large amount of sulfide, carbon oxide and nitrogen oxide), sulfuric acid, nitric acid and acetic acid liquid points will be formed in the presence of condensate, causing chemical corrosion.

4. The adhesion of stainless steel surface contains acid, alkali and salt substances (such as alkali water and lime water splashing on the decoration wall), causing local corrosion.

Screws can be divided into many categories according to different purposes: the main categories include ordinary screws, machine screws, self tapping screws and expansion screws; Machine screws can be divided into longitudinal fastening screws and transverse expansion screws; It can also be divided into triangular thread, pipe triangular thread, trapezoidal thread and square thread.