Can you MPI over paint?
Painting or coatings 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.
What are the defects that are faced after magnetic particle testing?
Magnetic Particle Inspection (MPI) is a very effective method for location of surface breaking and slight sub-surface defects such as cracking, pores, cold lap, lack of sidewall fusion in welds etc in magnetic materials.
What is an important consideration when inspecting a coating application?
The specification should define the optimal application conditions. It is important to inspect the film thickness of powder coatings and liquid coatings before the coating cures so that and deviation from the specification can be detected and repaired before curing.
Can magnetic particle testing be done on painted surfaces?
The thicker the paint, the less sensitive the test. That being said, magnetic particle testing over paint can work very well. Magnaflux even makes contrast paint to be used with magnetic particle testing.
Which material can’t be tested by MPI?
Magnesium (Mg)
9. Which of the following material can’t be tested by magnetic particle testing? Explanation: Magnesium (Mg) is a non-magnegnetic material. So, it can’t be tested by magnetic particle inspection.
Can MPI be done on Aluminium?
The MPI technique canNOT be used on non-ferromagnetic materials such as high alloyed steels (austenitic structure), aluminium, copper, plastics, composites, etc. To test a part using the MPI technique, the part first needs to be magnetised.
What kind of defects can be detected under MPT?
Magnetic particle testing (MPT) is a way to test ferromagnetic metals like iron, steel, and nickel for defects, such as cracks.
Can MPI detect subsurface defects?
Magnetic Particle Inspection (MPI) is a non-destructive testing method that can detect surface and subsurface flaws in ferromagnetic materials.
When coating a patch as part of maintenance the film thickness should be microns?
To achieve the required specification: Minimum 288 µm.
What is IMO PSPC?
This standard, usually abbreviated as IMO PSPC (Performance Standard for Protective Coatings), was introduced after signifi- cant ship damages (and even losses of ships) due to corrosion of ballast tanks, and thus is fundamentally intended not only to protect sea vessels but also to enhance the safety of maritime …
Can you mag particle through paint?
6. You can mag through coatings. According to ASTM E709-15, “Thin nonconductive coatings, such as paint in the order of 1 or 2 mil (0.02 to 0.05 mm) will not normally interfere with the formation of indications, but they must be removed at all points where electrical contact is to be made for direct magnetization.”
What are the most common defects in coating coating?
Coating Defects Page 4 of 35 Issue Date: 13/05/2014 Defects –Fault Finding BUBBLES Due to corrosion Due to drying Due to air trapping CAUSES Due to corrosion: 1. Mechanical damage on the painted surface with subsequent humidity infiltration 2. Insufficient preliminary substrate pre-treatment or incomplete anti-rust treatment 3.
What are the common defects in paint?
Defects –Fault Finding BUBBLES Due to corrosion Due to drying Due to air trapping CAUSES Due to corrosion: 1. Mechanical damage on the painted surface with subsequent humidity infiltration 2. Insufficient preliminary substrate pre-treatment or incomplete anti-rust treatment 3. Rust formation on sanded or damaged surfaces 4.
How to determine the cause and mechanism of coating failure?
To determine the cause and mechanism of coating failure, all possible contributory factors must be evaluated together with a detailed history from the time of application to the time the failure was first noted.
What is MPI (magnetic particle inspection)?
Magnetic Particle Inspection (MPI) is one of the most widely used non-destructive inspection methods for locating surface or near-surface defects or flaws in ferromagnetic materials. MPI is basically a combination of two NDT methods: Visual inspection and magnetic flux leakage testing.
