Magnetic particle testing procedure involving pre-coating with a

Details Magnetic particle testing procedure involving pre-coating with a Magnetic particle testing procedure involving pre-coating with a

1980-03-12

1982-03-23

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

By paramagnetic particles

G01N 2784, G01R 3312

Patent

active

043215343

ABSTRACT:
A method for testing a magnetizable workpiece for flaws by the magnetic particle inspection method wherein a coating of finely divided, hydrophobic particles is electrostatically applied onto the surface of a workpiece to be tested after which an aqueous suspension of magnetizable particles is applied over the resulting coating. The magnetized workpiece is then inspected for deposits of magnetizable particles which have become lodged in the flaws. The hydrophobic nature of the coating repels the water from the suspension, and permits the indications to appear promptly after application of the magnetizable particle suspension.

REFERENCES:
patent: 3345564 (1967-10-01), Makino et al.
patent: 3445759 (1969-05-01), Pevar
patent: 3826917 (1974-07-01), Molina
"Magnetic-Particle Inspection", Metals Handbook, Eighth Edition, vol. 11, pp. 55-60.

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