Casting coating is a basic coating for gravity metal casting, suitable for metal molds. The cast paint particles are relatively coarse and have good heat insulation performance, which can prevent a part of the casting from being cast and cooled and isolated. Suitable for thin section castings and large flat castings, feed ports, hubs, pistons, cylinders, connecting rods, etc. Then let Xiaobian take everyone to look at the relevant introduction of the relevant content of the foundry coating .
First, the color
Black, white, red, yellow, etc.
Second, the main raw materials
Special diatomaceous earth, removing 5-8% of bound water and organic matter and impurities in diatomaceous earth; AL2O3, Sio2.; casting coating suspension agent (lithium-based concave soil, organic soil, etc.).
Third, the scope of use
Metal mold surface, iron touch / aluminum touch / copper touch;
Fourth, the function
1. ZD coating is used for heat insulation, equalizing temperature, avoiding the impact and corrosiveness of molten metal, so as to achieve protection of the touch tool and prolong the service life of the touch tool for more than 1/3;
2. Prevent cracking and white iron formation caused by excessive cooling of the casting products;
3. The adsorption time is as long as 7 days, and the gas permeability is good. Each time the mold release can be replaced by acetylene smoke treatment instead of the release agent, a casting can be smoked once;
V. Advantages
1. Its unique physical properties compared to phosphate coatings determine its advantages;
2, good ventilation;
3, the thermal insulation effect is obvious, the melting point is above 1650 ° C;
4. After spraying, the adhesion is strong and should not be peeled off. Usually it needs to be repaired after one week. ZD coating does not need to be sprayed every time, like other coatings, eliminating the tedious work of disassembling the fittings every day due to the spraying of paint;
5. Relatively cheap, greatly reducing the cost of expensive production casting due to the use of alcohol-based or imported coatings;
6. Greatly improve production efficiency.
Sixth, the recommended method of use
100 g of coating powder + 100 g of neutral water glass + 300 g of water, pour into the soymilk machine and mix thoroughly, then pour into the metal mold surface sprayed on the heat (200-300 ° C), thickness 0.2 Mm, local thin parts can be sprayed 0.3-0.4mm thick according to product requirements, drying can be. About 20--30 pairs of touch tools can be sprayed. If there is any discrepancy, the manufacturer's needs shall prevail!
Seven, the advantages of alcohol-based casting coatings:
1. After painting and igniting, the coating layer on the surface of the core and core can be dried by itself without going into the drying kiln;
2, easy to use, short production cycle;
3. The type and core of water glass sand can be applied.
8. Casting sand is because the coating does not effectively block the isolation, or the coating reacts with the high temperature metal liquid.
1. Poor adhesion of paint: the paint peels off when the sand is shaken, causing the casting to stick sand.
2. The coating has a large expansion coefficient: when it is in contact with a high-temperature metal liquid, the coating is heated and expanded by the mold, which causes the casting to adhere to the sand.
3. The high temperature liquid metal is oxidized to chemically react with the coating and the mold to form a metal oxide, which has strong adhesion to the coating and the molding sand, and can firmly adhere the molding sand to the surface of the casting to form a series of low melting point compounds. [In the thick wall and corner of the casting, etc., the low melting point is more, the sanding layer is later), causing the casting to stick to the sand. Sometimes, although no sand is generated, a layer of paint which is difficult to remove is adhered to the surface of the casting, and Produces sticky ash.
How about, I read Xiaobian’s introduction to foundry coatings, and I have a certain understanding of the related content of foundry coatings. I hope that these introductions will help you, and you will be able to create a more perfect home environment. Ok, today's introduction is here. Thank you for your reading of this article and your support and love for Xiaobian. If you want to get more information about home decoration, please continue to pay attention to the decoration home network.
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