Chemical milling stainless steel signs

Practical: a large stainless steel plate production, such as the maximum size up 6mXl.2m, corrosion depth of up to 0.6mm.

Small signs production may be photolithography or etching silk screen, large signs can take the printed film etching.

Process is as follows.

(1) to the oil. First with an organic solvent to oil, then chemical degreasing. Oil divisible ensures corrosion protection coating and the substrate binding firm. Wash water after degreasing, dry.

(2) coated with protective coatings. Optional protective coating and the substrate should have good adhesion, high strength and tensile elongation. A coating thickness of o.2 o.3mm. Coating without sagging, no particles and air bubbles. Dry.

(3) curing. The coating has sufficient strength and adhesion, curing temperature and time depending on the type of paint may be.

(4) repair. During operation due to particles, bubbles, inclusions damage and affect the performance of repair. Repair part required hot air (hair dryer) partial cure.

(5) printing. First with computer typesetting drawing, then the required text pattern printing to corrosion protective coating. At the same time to carry out the depth and width of the two directions in the etching process, the incremental corrosion depth and width between 0.8 a 1.1mm, 0.3mm workpiece machining depth than on the concave word signs, lines, text and graphics design according to corrosion depth scaled down Braille signs for line drawings should expand outside dimensions.

(6) marking. With a scalpel (blade) will be printed with a protective coating of text and patterns carved through, it is necessary to cut through the coating, but also less damage to the substrate, and then thrown off the required corrosion protection coating portion.

(7) Milling. Corrosion milling liquid formula:

Corrosion milling fluid pumped through nozzles onto the surface of the workpiece, the liquid back to the etching bath. The signs of corrosion when upside down again to half the depth, the depth of etching is the same. Injection amount to be evenly distributed. Injection pressure 1.5-2kg / cm2 (1kg / cm2 = 98.067kPa). Finally washed with water.

(8) trimming. Removal of the excess of signs.

(9) to clean up. Remove protective coating, remove corrosion products.

(10) filled coatings. Paint filling recess, highlight the text pattern, paint drying.

(11) cover varnish. Spraying, drying polyurethane varnish.