Corrosion assessment is done for several reasons. Sometimes it is for evaluating material in a different environmental condition, while other times it is to estimate the test efficiency of substances that reduce a material’s corrosion rate. Plus, understanding the corrosion mechanism is another reason. Based on these reasons, the corrosion tests are categorized into lab tests and field tests. The following section will throw light on the lab tests for corrosion assessment.
Laboratory Tests For Corrosion Assessment
- Immersion Test:
In this test, the weights of dried test samples are evaluated before and after being exposed to a corrosive environment for a particular time. Before and after the weighing of samples, any corrosion product present or organic contaminants should be removed. The corrosion-resistant ability will be calculated on the basis of the loss of weight and thickness in millimeters per year. - Weather Test:
This test determines the durability of the coated specimens, by exposing them to UV light and cyclic heating-cooling in a corrosive environment.
Know about IWL’s zinc rich primer, which protects steel against corrosion. - Visual Test:
Visual tests are done to evaluate exfoliation or pitting in the material using methods like determining the density of the pits or pitting factor. Even a contour gauge can be used to obtain the pit depth. Besides, visual evaluation can also be done via an analysis of elements and composition via energy dispersive X-ray, spectroscopy, etc. - Fog Test:
The fog test assesses crevice corrosion, erosion-corrosion, and stress corrosion cracks using a salt spray. By atomizing 5% NaCl solution in a chamber at 95 degrees Fahrenheit, the period during which the specimen can resist corrosion is comprehended. This time determines the durability of the sample against corrosion.
Conclusion
Besides corrosion assessment, materials can also be treated for corrosion resistance. Plus, anti-corrosion solutions and adhesives can also be used, just like a pypkote wrapping coating is used in pipelines. To know more about anti-corrosion solutions, waterproofing membrane, sealants, adhesives, primers, and other solutions at IWL.
