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Magnetic Process

Magnetic Process

Magnetic test method according to the standards ISO 2178, ASTM 7091

Functional principle

A permanent magnet generates a constant magnetic field with a strength that corresponds to the thickness of the coating to be measured or the distance between the measurement probe and the base material. The magnetic field strength is measured by a suitable sensor; using the characteristic probe output function, i.e., the functional correlation between the measurement signal and the coating thickness. The measurement signal is converted in the instrument into a coating thickness value.

Schematic diagram of the magnetic test method. The penetration depth of the magnetic field depends on the permeability of the base material.
Schematic diagram of the magnetic test method. The penetration depth of the magnetic field depends on the permeability of the base material.

Main fields of application: Non-magnetizable coating material on steel or iron or nickel coating on non-ferrous metal base material.

  • Thick electroplated coatings of chrome, zinc, copper, aluminum etc. on steel or iron
  • Thick coatings of enamel, paint or plastic on steel or iron
  • Galvanically deposited nickel coatings (Ni) on copper or aluminum; also suited for nickel coatings on pc-board contacts, even under a thin gold coating
  • Chemically deposited nickel coatings (Ni), if magnetizable, on copper or aluminum

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