Magnetic Particle Inspection (MPI) is one of the best options for non-destructive testing if you are dealing with ferromagnetic metals. It can provide fast, accurate results for various alloys of iron and grades of steel. Most importantly it won’t cause any damage to the raw materials or components. It can even work on welds.
Painting or coatings
One thing you need to consider though is what kind of finish is on the metal. Many people choose to paint irons or steels to improve the corrosion resistance. Some users will even opt for galvanisation or plating.
However, if there is a thick coat of paint or a protective coating, it will cause issues with MPI. While the metal substrate will still be magnetic, the outer coat probably won’t be. As a result it may not allow a tester to see where there are discontinuities in the item. The thicker the paint, plate, or coating, the harder it will be to spot issues.
What to do?
There are a number of options here. Firstly is to get magnetic particle inspection before adding the final coating to the metal. This can be a good option and will ensure there are no surface or near surface defects that could become an issue.
If you do have to deal with a metal that is pre-coated or finished, the only option is to choose a different kind of NDT. Luckily there are plenty of choices here. For example you could try Ultrasonic Testing (UT).
Arranging professional Magnetic Particle Testing
Format NDT Ltd works hard to be a leader in our field. Our aim is to ensure we can offer non-destructive testing solutions for a wide array of needs. To do this we make sure our team have experience with various methods, including MPI, UT, Gamma, and more. In addition they have access to some of the very best testing equipment. They can test products and accurately interpret the results.
So, whether you are dealing with a raw metal without a coating or a coated product, you can ask us to arrange testing. We will choose the right method to get the best possible idea of the condition of the item. You will receive a full report and can ask us any questions about the findings or the testing itself.