Rust Problem And Prevention Methods Of Stainless Steel Cable Ties
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Many people don't know about the rust problem of Stainless Steel Cable Tie. In fact, this is what people often call pitting, and some people call it pitting or pinhole corrosion. Rust problems generally occur in specific corrosive media, so they have certain specific effects. So how can we prevent them? The following is a brief introduction to the rust problem and prevention methods.
Rusts usually occur in solutions containing halogen anions or anions. Among these substances, chlorides and bromides are particularly corrosive, which is a very common local corrosion phenomenon of stainless steel.
1. First of all, we need to understand the cause of rust. When the medium contains some active anions (such as c1-), these active anions will destroy the passivation film on the surface of the stainless steel, because after the passivation film is destroyed, the matrix inside will be exposed, and the exposed part of the metal will be in an activated state. As for the part of the passivation film, it is in a passive state, so there are conditions for the formation of active-passive corrosion.
Since the anode area is smaller than the cathode area, and the density of the anode current is relatively large, the anode metal can corrode into small holes in a very short time, which becomes the main reason for the formation of rust spots.
2. Let's take a look at the factors that affect rust spots, among which the medium is the main factor. In addition to halide anions, there are many oxidizing metal ions (common ones such as Fe", Cu and Hg, etc.) that are also common factors that can cause rust spots.
Oxygen and other oxidants in the solution are also necessary conditions for pitting. Because of the influence of alloy elements, adding a certain amount of molybdenum to the stainless steel material can well improve the stability of the film and allow the stainless steel surface to form a fine and firm passivation film. Among them, chromium can improve the repair ability of the stainless steel passivation film and allow the passivation film to regenerate.
3. How should we prevent the formation of rust spots? The following can be taken Several methods:
1) Choose a cable tie made of austenitic stainless steel containing relatively high chromium and a certain amount of molybdenum.
2) Control the concentration of halogen ions in the solution, especially C1-ions, to avoid local concentration of the solution.
3) Add a certain amount of corrosion inhibitor to increase the pH value of the solution; at the same time, the temperature of the medium needs to be lowered. Studies have found that the higher the temperature, the more obvious the rust spots.
With the deepening of research and the development of technology, other methods to prevent rust spots on stainless steel cable ties will appear in the future. Of course, this also requires us practitioners to constantly explore, observe and summarize from actual work.
