Brief analysis of acid corrosion and acid polishin

Brief analysis of acid corrosion and acid polishing of art glass

glass can resist many kinds of acids, while phosphoric acid and hydrofluoric acid can easily corrode and polish the surface of art glass. Using hydrofluoric acid and other substances to corrode the surface of art glass is very dangerous. It can hurt human skin and even bones, and the volatile gas is toxic and corrosive. Therefore, the pickling of glass must be carried out with extra care, and professional extraction and washing equipment are required, including protective covers for removing corrosive gases, wide mouth plastic containers, suitable storage space and working equipment. Plastic spoon with long handle is a very useful tool, but it can also be used after the metal spoon is wrapped with wax. Workers should wear protective clothing, boots and masks when handling acid. It is recommended to equip alkaline neutralization equipment to solve emergencies

the depth and effect of corrosion depend on the strength and temperature of acid, the quality of art glass and soaking time. The pickling method of pickled glass needs to be adjusted according to different conditions. Generally, hydrofluoric acid with a concentration of 60% in 4 parts of water core is generally applicable. If deep pickling is required, 2 parts of water and 1 part of hydrofluoric acid are required. Remember to add acid to water instead of water to acid in the next 10 years. Four parts of water and one part of acid can corrode about 1.5mm thick glass in two hours. A formula from Scandinavia is: 3 parts of hydrofluoric acid with 60% concentration +5 parts of water +1 part of sulfuric acid with 90% concentration. There is an acid formula that can make the surface of soda lime glass achieve the effect of satin Matt:

hydrofluoric acid (60%) 1.0kg=2 pounds

ammonium hydrogen fluoride choose the corresponding working mode according to the product requirements, according to the length of the spring itself 0.2kg=6 ounces

sulfuric acid 0.2kg=6 ounces

many artists use acid to corrode the surface or inner layer of glassware, achieving the ideal effect. The pickling operation procedure for producing bulb effect is roughly bhsi422 flat: wash the glass with hot water, spray the corrosion solution on the glass surface or immerse the glass in the corrosion solution for 20 seconds, and then wash with hot water

to obtain decorative patterns on the glass surface, wax paper templates can be used to resist acid erosion. Usually, the heated glass is put into the molten wax. After the wax is completely covered on the surface of the glass, the wax of the decorative pattern is removed, and the glass is immersed in the corrosive solution to obtain the desired effect

wax, liquid (petroleum) asphalt and lead foil are commonly used materials to cover the surface of glass to resist corrosion. The corrosion solution, known as milky white etchant or French Blue West relief, is a viscous, slow corrosion but still toxic pickling solution. Caution is required for safe operation. Its formula is:

ammonium hydrogen fluoride 1kg=2.25 pounds

sugar 1kg=2.25 pounds

barium sulfate 125g=4.5 ounces

soft water 1l=1.75 pints

the role of sugar in it is to increase the viscosity of the solution, which is also known as "sugar acid", which is often sold in the market in the form of tubular colloid. It is mainly used for the corrosion of marks and badges on glassware. The surface of glass can become transparent and glossy after soaking in hydrofluoric acid, and different acid formulas can form different effects on the surface of glass. The formula of polishing acid is:

3 parts of soft water

2 parts of sulfuric acid (95%)

2 parts of hydrofluoric acid (60%)

polishing with acid can save the time of manual and machine polishing, which is widely used in today's factories, and artists also use acid to alleviate the glass surface after sandblasting, producing a more delicate and exquisite effect than sandblasting. In Britain, strong acid is often used in industry to soak the glass for a short time, and the solution contained in the pores will gradually seep out and soak it temporarily, while in continental Europe, slightly weak acid is used to soak the glass for a long time. Polishing acid works best at a temperature of at least 40 degrees Celsius. In recent years, hydrofluoric acid and laser, as innovative materials, have been applied to the polishing of glass