Quartz ring appearance before cleaning.

With PTC18 cleaning agent, soak for 60 minutes at 120~140°C. Due to the large size of the quartz ring, only part of it can be soaked. After taking it out, wash it with hot water.

Dry with air gun. The white haze residue was found to have lightened significantly.

Keep testing. To prolong the cleaning time, soak for 3 hours with PTC18 cleaning agent at 120~140°C. Take it out, rinse it with hot water, and dry it with an air gun. It was found that the white mist residue had almost disappeared and cleared away.

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Before cleaning, a total of 40 layers of titanium dioxide/silicon dioxide metal coating were deposited for the appearance of the lens. Under the strong light in the dark room, the rotating lens has different luster at different angles.

Soak with PTC18 cleaning agent at 100~120℃ for 30 minutes.

After taking it out, wash it with clean water after the temperature of the lens drops. It was found that the TiO2/SiO 40 layer coating had been almost peeled off. Under the illumination of the strong light in the dark room, the different angles of the rotating lens will no longer have different luster. The remaining slight residual coating can be quickly removed by a little grinding with ceria/alumina.

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Appearance of stainless steel workpiece with SiO2 coating before cleaning. Under the fluorescent lamp, you can roughly see the rainbow pattern (the left of the picture below), and under the strong light in the dark room, you can see that the attached coating presents irregular whitening lines.

The stainless steel workpiece without SiO2 coating has no irregular white reflection under the strong light in the dark room.

Soak the stainless steel workpiece with SiO2 coating halfway in PTC18 cleaning agent at 90~100℃ for 10 minutes.

After placing the stainless steel workpiece, the SiO2 coating can be seen to react and decompose at the initial stage.

After about 5 minutes, it returned to calm. Shows that the internal stainless steel material does not participate in the reaction. The medicine has not changed color at all, showing that the stainless steel material has not been damaged, and the iron ions have not been dissociated to make the medicine reddish brown.

After taking it out, wash it with clean water.

Under the fluorescent lamp, it can be clearly seen that the submerged part of PTC18 has exposed the luster of stainless steel (the upper part of the picture below is the submerged area under the subsurface). The SiO2 coating has been completely stripped clean. Pay attention to the texture of the stainless steel section, the luster has not become blurred. In the area near the liquid surface, the peeling time of the SiO2 coating is different due to the shaking of the chemical liquid surface, but the color and luster of the exposed stainless steel surface do not change in depth; this shows that the SUS630 stainless steel will not be damaged by chemical immersion at all.
The darker part below is the area where the SiO2 coating has not been peeled off, and rainbow patterns can still be seen vaguely.

Under the illumination of strong light in a dark room, it can be clearly found that the SiO2 coating has been completely stripped off. The soaking area under the liquid surface on the right side of the figure below has no irregular white reflections.

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