| ABSTRACT
Present study reports improvement in chemical resistance of glazed wall tile by solgel
derived TiO2-Fe2O3 thin film coatings on the glazed surface. Effect of firing
temperature on the chemical resistance of the coating was estimated after firing at
different temperatures (600o, 700o and 800oC). The chemical durability of the coated
substrate in comparison to the uncoated was tested against acidic attack by immersing
them in 3% (v/v) hydrochloric acid solution and 10 wt% citric acid solution and basic
attack by immersing them in 20 wt% potassium hydroxide solution in accordance
with IS: 13630 (Part 8): 2006 standard. Further, the coated surface was also tested
against basic attack in 1 N sodium hydroxide and 2.5 wt% detergent solution for
seven days. The chemical durability was quantitatively estimated by measuring gloss
at the surface at regular time intervals. Acid resistance was found to be good for
coated substrate fired at all test temperatures. The coated substrate fired at 800oC
showed high alkali resistance as compared to the uncoated substrate. FESEM and IR
studies substantiate the corrosion resistance of the coated surface fired at 800oC.
[Keywords: Thin film coatings, Glazed ceramic wall tiles, Firing temperature, Chemical
resistance] |
