A kind of enamel coating resistant to sulfuric acid and hydrochloric acid dew point corrosion and its preparation process
A hydrochloric acid dew point and preparation process technology, applied in the field of inorganic protective coatings, can solve the problems of poor acid and alkali corrosion resistance, easy formation of pores on the surface of the coating, and expensive preparation costs, and achieves non-toxic and excellent resistance to the preparation process. Corrosion performance, non-toxic effect of preparation process
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[0042] The preparation process of the enamel coating comprises the following steps: (1) slurry preparation, (2) bottom glaze slurry spraying, (3) high temperature firing of the bottom glaze, (4) cooling, (5) surface glaze Slurry spraying, (6) surface glaze firing at high temperature, (7) cooling.
[0043] In the slurry preparation process, use a planetary ball mill to mix the analytically pure raw materials weighed according to the formula for 1-2 hours, and then smelt at 1350-1450°C for 2-3 hours, then water-quench into glass glaze blocks, and use planetary The glaze block is ball-milled by a type ball mill, and finally the enamel powder after ball milling is passed through a 200-mesh sieve. The process of planetary ball mill ball milling glaze block is as follows: the speed is 300-400r / min, and the time is 100-200h. Add analytically pure micron oxide particles to enamel powder to form a mixed powder, mix the mixed powder with absolute ethanol at a ratio of 1g: 10-20ml, and ...
Embodiment 1
[0047] In this example, according to the proportion of SiO 2 : 60.0%, Al 2 o 3 : 5.2%, Na 2 O: 10.9%; K 2 O: 5.2%, B 2 o 3 : 10.9%, CoO: 2.2%; CaF 2 : 5.6% (mass fraction) equipped with raw materials, mixed by planetary ball mill for 1.5h, then smelted at 1350°C for 2h, water quenched into enamel block. The enamel glaze is subjected to planetary ball milling for 150 hours at a speed of 300 r / min, and the enamel powder is passed through a 200-mesh sieve. Weigh 1.8g of the enamel glaze powder, 0.2g of aluminum oxide with a particle size of 1-10 μm, add 30ml of absolute ethanol, mix well, put them into an ultrasonic vibrator to fully vibrate and disperse to obtain a slurry. The slurry was sprayed onto the surface of the sandblasted Q235 steel sample by spraying, and then fired at 860°C for 300s, taken out and air-cooled to obtain an enamel bottom glaze layer.
[0048] In proportion to SiO 2 : 61.3%, Al 2 o 3 : 5.4%, Na 2 O: 11.1%; K 2 O: 5.4%, B 2 o 3 : 11.1%, CaF ...
Embodiment 2
[0051] The difference from Example 1 is that: the Q235 steel coated with the enamel coating with a thickness of 200 μm was corroded by 80° C. and 30 wt % sulfuric acid solution for 7 days. After corrosion, the coating is intact, and there is no phenomenon of blistering or peeling. like image 3 As shown, it can be seen from the corrosion kinetic curve that the weight loss of the coated sample is only -0.1035mg / cm2 after 7 days of 30wt% sulfuric acid corrosion at 80°C 2 . The sulfuric acid corrosion resistance of the enamel coating is much higher than the national standard (national standard GB / T19353-2003 for boiling sulfuric acid corrosion resistance: after 18 hours of corrosion, weight loss 2 ). The uncoated Q235 steel exhibits catastrophic corrosion. After 2 days of corrosion, the entire sample was completely corroded and dissolved by the sulfuric acid solution.
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