PROCEDURE FOR DETERMINATION OF STRENGTH OF POWDER COATING Russian patent published in 2010 - IPC G01N3/08 G01N19/04 

FIELD: metallurgy.

SUBSTANCE: procedure for determination of strength of powder coating produced by plasma sputtering with successive hardening by electro-mechanic treatment consists in application of powder coating on surface of hollow cylinder sample. Thickness of coating is it is further hardened by electro-mechanical treatment. On internal surface of the hollow cylinder sample there is made a circular groove at depth t_gr equal to 0.75-0.85 of thickness of wall t_treat of the hollow cylinder sample which is determined from condition t_treat>10t_coat. The circular grooving at the same depth is made on a reference-specimen. The sample with coating and the reference-specimen are tested for axial tension to destruction, upon which there determined strength of powder coating from condition:

where: σ_{u coat} is ultimate strength of coating: σ_{u samp} is ultimate strength of the sample with coating; σ_{u ref} is ultimate strength of the reference specimen;

- is relative area of coating cross section; A_coat is area of cross section of coating in the point of destruction; A_samp is area of cross section of the sample with coating in the point of destruction.

EFFECT: upgraded accuracy and reliability of determination of strength of powder coating.

4 dwg, 1 tbl, 1 ex