In daily life, a large proportion of consumers believe that stainless steel screws are not rusty, but sometimes we may find that the stainless steel screws we use have already started to rust. So what is the reason for stainless steel screws? Let’s take a look at the analysis of the reasons for stainless steel screws rusting for your reference.

Reasons for Rust on Stainless Steel Screws:

1. The attachment of dust or heterogeneous metal particles, in humid air, and the condensate of stainless steel screws, connect the two into a micro battery, which causes electrochemical reaction and damages the protective film, which is called electrochemical corrosion.

2. The surface of stainless steel screws adheres to organic juices (such as melons and vegetables, noodle soup, phlegm, etc.), forming organic acids in the presence of water and oxygen. Over time, organic acids corrode the metal surface.

3. The adhesion of stainless steel surface contains acid, alkali and salt substances (such as the splashing of alkaline water and Limewater for wall decoration), which causes local corrosion.

4. In polluted air (such as atmospheres containing a large amount of sulfides, carbon oxides, and nitrogen oxides), condensation water forms sulfuric acid, nitric acid, and acetic acid droplets, causing chemical corrosion.

The above situations can cause damage to the surface protective film of stainless steel screws, leading to corrosion. So, to ensure that the surface of stainless steel screws is permanently bright and not corroded. We need to clean the surface. Passivation and other treatments.