How to Prevent Corrosion on Fasteners

1. How to Prevent Corrosion on Fasteners

2. When you install a fastener, you expect that it will stand the test of time. For large and small projects, fasteners act as the glue that holds together different pieces to form a structure that has integrity. But there's one enemy that threatens the strength of metal fasteners corrosion. Electrochemical corrosion also called as “rust,” can decrease a fastener’s strength and make it useless. According to cable tray manufacturers, choosing the right materials and taking the right action can help in reducing the chances of corrosion and maintain the strength of the structure over the long-term. Here’s a look at why corrosion occurs and how to prevent corrosion on fasteners of different types produced by fasteners manufacturers in India.

3. Causes of corrosion Corrosion occurs when a metal’s inherent properties start to degrade. All metal, including the metal used in making fasteners, have electric potential. But different metals have different electrical potential. When two metals interact with water or moisture, a galvanic cell is formed, and an electric charge starts flowing between the two metals. This low-energy flow causes degradation to the metal which has higher electric potential. The higher-potential metal loses electrons to the lower-potential metal. This transfer of electrons causes the formation of rust on the higher potential metal. The more the difference in the electric potential of two metals, the more quickly the metal will corrode. So if a fastener is fabricated with a high-potential metal and installed upon a low-potential metal, the chance of corrosion is high.

4. Types of corrosion in fasteners Galvanic Corrosion: It happens when different types of metal are joined, and charge flows from one to the other, causing corrosion. Uniform Corrosion: This happens across the whole surface area of a fastener when it is not correctly coated or plated. Crevice Corrosion: It appears in small gaps and openings in the fasteners when they are not ventilated. Pitting Corrosion: This leads to the appearance of tiny holes in a fastener, which are difficult to detect. It is most likely to occur in noble elements like nickel and chromium but can be avoided by keeping surfaces clean. Intergranular Corrosion: It occurs in stainless steel when it reaches extremely high temperatures.

5. How to Prevent Corrosion The first step to prevent corrosion is to use insulation, coatings or paint to seal the fasteners that are made of a different metal than the material they will be installed upon. These coatings can help curb the occurrence of rust and other types of corrosion. Also, it is essential to install fasteners in a way that constant pressure is delivered upon them. If the load on a fastener is continuously changing, it can accelerate the occurrence of corrosion. It is also essential to be strategic about choosing the materials to use in manufacturing and construction. The flow of charge and the rate of corrosion are higher when flowing from a small object to a larger area. So it is best to use fasteners that are similar in electric potential to the materials which they are fastening together. This will decrease the flow of electricity, which will then diminish the rate of corrosion.

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