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Sustainable Construction and Design <strong>2011</strong> The abrasion resistance of coatings depends on its hardness, therefore it is needed to measure the microhardness. The micro-hardness tests showed that the Techigalva coatings had 48HVM in average, while the heat treated coating had 106 HVM in average.The testing points on the specimen’s surface can be seen in figure 3. we have selected 10 – 10 test speciemens and after measuring each ones the registered hardness values were averaged that are summarized in Table 1. Figure 3. The hardness measuring points on the specimen’s surface Table 1. the measured micro Vickers hardness values Measuring point „Technigalva” sample [HV M] „Heat treated Technigalva” sample [HV M] 1 48,7 98,2 2 50,7 97,3 3 45,9 114,2 4 46,8 92,5 5 49,7 96,3 6 45,9 89,5 7 51,8 101,4 8 49,7 105,4 9 45,9 108,2 10 54,0 112,2 11 45,9 112,2 12 42,5 103,5 13 41,7 96,3 14 43,3 91,2 15 44,7 91,2 Figure 4. and 5. show the SEM-pictures made from coatings, introducing the distinguished layers and EDS sampling areas. Certain layers, phases can be separated very good in the thousand-fold magnification. We have also carried out EDS (Electron Detector System) tests. EDS spectra result are summarized in table 2., the measured graphs can be seen in Figure 6. 84 Copyright © <strong>2011</strong> by Laboratory Soete
Sustainable Construction and Design <strong>2011</strong> Figure 4. 1000X-magnification of Technigalva specimen zinc coating, (numbered layers with indicated EDS zone) Figure 5. 1000X magnification of specimen heat treated zinc coating, (numbered layers with indicated EDS zone) Table 2. EDS spectra result of Fe, Zn and Pb values (%) Technigalva „T” Heat treated Technigalva „H” Layer Fe (%) Zn (%) Pb (%) Fe (%) Zn (%) Pb (%) 1 16,4 83,6 - 47,5 52,5 - 2 10,1 89,9 - 16,3 87,7 - 3 - 100 - 19,6 79,6 0,8 4 - 21,2 78,8 17,9 82,1 - Figure 6. EDS spectra of Technivalva layer, phase Gamma (1) Figure 7. EDS spectra of heat treated Technivalva layer, phase Gamma (1) Copyright © <strong>2011</strong> by Laboratory Soete 85
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