The Major Types Of Corrosion In Pipelines

In one of our previous blogs, we learned about the causes of pipe corrosion. The most common were acidic water, high concentration of oxygen in water, temperature and speed, and presence of sediments, bacteria, minerals, and metals in the water. All these factors cause different types of corrosion to the pipeline, the treatment of which is of utmost importance. 

There are some significant methods of treating corrosion including coal tar epoxy coating, plant-applied tape system, polyolefin, etc. However, before finding a suitable treatment it is important to know about the type of corrosion taking place in the pipe. So, let us read about that first, in the following section. 

The Major Types Of Corrosion In Pipelines

  1. Uniform Pipe Corrosion

The uniform pipe corrosion results in uniform damage or loss of the material at the pipe surface. This leads to a constant thinning of the wall. The intensity of the corrosion depends on the degree of penetration of the surface. However, by selecting the right piping material in addition to protecting it with surface coatings, such damage can be prevented. 

  1. Pitting Corrosion

This type of corrosion leads to a cavity on a specific surface area of the pipe. This happens due to defects in pipe materials, mechanical damages, or penetration by strong chemicals. Aluminum or steel pipes are prone to such corrosions. This can be prevented by choosing s suitable pipe material that can even resist chemical penetration. Alternatively, anodic protection methods can be used. 

  1. Selective Leaching

This happens when a noble metal reacts with the highly reactive element and forms an alloy. This results in the release of the reactive element from the surface, which further reduces the strength of the pipe, and leads to breakage. 

  1. Galvanic Corrosion

Galvanic corrosion is a result of the electric reaction between dissimilar alloys or metals of varied corrosion capacities. Here the metal that acts as an anode gets damaged among the two. One can prevent this by coatings and also using a combination of metals lying closely in the galvanic series. Keeping an insulation material between the two metals is necessary for the latter method.

  1. Crevice Corrosion

This is caused due to high-speed reaction at the joints and other pipeline crevices, due to the presence of varied oxygen. Here, surfaces that do not get oxygen, become anodes and get damaged in the electrochemical reaction. Such damages can be prevented by replacing riveted joints with welded ones. 

  1. Erosion Corrosion

When the working pressure of the liquid goes below the vapor pressure, vapor bubbles get formed. These bubbles collapse on the inside of the pipe surface, leading to cavitation or corrosion. Here, an anti corrosion pipe wrapping tape can work the best in minimizing the loss of materials. Plus, cavitation can be prevented at the time of designing the pipe and even by adding chromium to steel pipes.

Conclusion

IWL India leads in providing high-performance anti-corrosion coatings, tapes, materials, and adhesives. Visit the website to know about the features and specifications of our products. Get in touch for inquiries.

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