We test new properties of the surface sintered from modified powder or adhesion of modified material by itself using following methods:
- scratch test
- measurement of direct stress of the bond (metal-polymer-metal, polymer-metal)
- cross-cut test – test I., II.
- abrasion tester – test III.
Test I – adhesion of final layer – cross-cut test according to ISO 2409
Water based paint was applied by spraying on the sintered surface to cover it in sufficient amount without any additional pre-treatment (primer, flame, roughing) of the surface. Then a test of adhesion was done using cross cut method according to the ISO 2409 and evaluated according to attached etalons. Samples from modified material show very good results, when evaluation corresponds to classification No 5 for the unmodified sample (on the left) and classification No 0 or 1 for modified one (on the right).
Test II – adhesion of final layer – cross-cut according to ISO 2409 after absorption in water
Absorption of the samples sintered from modified powder, painted with water based, color in distillated water at 70 °C for 24 hours
Before exposition (adhesion – cross-cut 2 mm)
| Sample | SGX 85 | SGX 38 |
| front side | Gt0 | N.A. |
| back side | Gt0-1 | N.A. |
After exposition (adhesion – cross-cut 2 mm)
| Sample | SGX 85 | SGX 38 |
| front side | Gt0 | Gt0 |
| back side | Gt0 | Gt0 |
(Gt0 = the best, Gt5 = the worst).
Determination of stone-chip resistance of coatings according to ISO 20567-1, 1 cycle
| Sample | SGX 85 | SGX 38 |
| front side | N.A. | St 0,5 (0,2 %) |
| back side | N.A. | St 0,5 (0,2 %) |
Degree of destruction 0,5 = the best, degree of destruction 5 = the worst, see photo below
Elcometer 1720 Abrasion, Scrubbing and Washability Tester
