Magnetic Paint Inspection (MPI)
Magnetic Paint Inspection (MPI)
Magnetic Particle Inspection (MPI) is one of the most excellent solutions for Non-Destructive Testing (NDT). It can deliver quick, precise results for various iron alloys and steel grades. Most importantly, neither the components nor the raw materials will be damaged. It even functions on welds.
To increase the corrosion resistance of iron or steel, many people opt to paint them. Some users may even choose to plate or galvanize their equipment.
However, MPI will have problems if there is a thick coat of paint or a protective coating. The outer coat may not be magnetic, but the metal substrate will still be magnetic. As a result, a tester might not be able to see where the item has discontinuities. It will be more challenging to locate problems the thicker the paint, plate, or coating is.
The only choice is to select a different type of NDT, which must work with a pre-coated or finished metal. Fortunately, several options are available. For instance, perform ultrasonic testing (UT).
Video 01: MPI White Contrast Paint
Advantages of Magnetic Paint Inspection (MPI)
- This inspection method enlarges fracture signs using backing paint.
Limitations of Magnetic Paint Inspection (MPI)
- MPI will have problems if there is a thick coat of paint or a protective covering.
Industrial Application of Magnetic Paint Inspection (MPI)
- Structural steel and plant equipment weld inspection.
