Study on Coatings Composition and Performance
The study investigated the targeted and measured concentrations of Ti and Zr in magnetron-sputtered coatings, their impact on conversion layer thickness, and the relative atomic concentrations in hydrothermal conversion layers on Al-12Zr and Al-12Ti. Open circuit potential values before and after hydrothermal treatment were also examined. The findings provide valuable insights into the composition-performance relationship of these coatings.
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Table 1: Targeted and measured concentration (using SEM-EDS) of Ti and Zr (in wt.%) in the magnetron sputtered coatings used in this study. Target wt.% of Zr or Ti 4 8 12 16 Measured Zr wt.% 1.5 6.1 11.5 16 Measured Ti wt.% 4.3 6.2 10.2 14.6
Table 2: Hydrothermally generated conversion layer thickness on pure Al and sputter deposited Al-Zr and Al-Ti coatings as a function of Zr, or Ti concentration measured using RF-GDOES sputtering. Zr Ti Sample name Conversion layer thickness Standard deviation Sample name Conversion layer thickness Standard deviation concentratio n wt.% 0 1.5 6.1 11.5 16 concentratio n wt.% 0 4.3 6.2 10.2 14.6 nm 1303 948 609 513 554 nm 167 41 5 7 6 nm 1303 747 715 569 356 nm 167 40 81 26 32 AA1090 Al-4Zr Al-8Zr Al-12Zr Al-16Zr AA1090 Al-4Ti Al-8Ti Al-12Ti Al-16Ti
Table 3: Relative atomic concentration of different elements in the three regions of the hydrothermal conversion layers on Al-12Zr, and Al-12Ti measured using TEM-EDS. Standard deviation Standard deviation Standard deviation Standard deviation Region Zr/Al O/(Al+Zr) Ti/Al O/(Al+Ti) Sputtered Coating Compact Oxide Needle Oxide 0.02 - 0.02 - 0.05 - 0.04 - 0.06 0 0.01 - 2.15 1.67 0.22 0.15 0.15 0.00 0.02 - 1.70 1.78 0.08 0.08
Table 4: Open circuit potential values for the pure Al, magnetron sputtered Al-Zr and Al-Ti coatings before and after hydrothermal treatment measured in a 0.1 M NaCl solution against an Ag/AgCl reference electrode. Hydrothermally treated Hydrothermally treated As received As received Concentration Concentration Sample name Sample name Standard deviation Standard deviation Standard deviation Standard deviation OCP OCP OCP OCP wt.% 0.00 1.5 6.1 11.5 16 mV vs Ag/AgCl 73.71 57.73 84.33 55.12 54.13 wt.% 0.00 4.3 6.2 10.2 14.6 mV vs Ag/AgCl 73.71 89.93 92.83 10.79 27.98 AA1090 Al-4Zr Al-8Zr Al-12Zr Al-16Zr AA1090 Al-4Ti Al-8Ti Al-12Ti Al-16Ti -645.20 -725.76 -738.19 -648.54 -640.98 -1289.65 -1271.60 -756.78 -805.17 -784.96 54.66 97.53 92.14 138.61 126.95 -645.20 -726.90 -721.54 -748.92 -655.27 -1289.65 -593.34 -650.23 -563.08 -481.79 54.66 34.06 30.67 43.82 31.36
