Water-based coating for preventing casting veins and preparation method thereof

Abstract

The invention relates to a water-based coating for preventing casting veins and a preparation method thereof. The water-based coating for preventing the casting veins comprises, by mass, 6%-8% of magnesium aluminum silicate, 40%-46% of water, 5%-8% of iron oxide red, 10%-12% of nano-alumina sol, 20-25% of mica powder and 10%-15% of aluminum silicate fiber. The preparation method comprises the following steps that one half of the total amount of water is taken and mixed with the magnesium aluminum silicate into a dispersing kettle to be dispersed, and pre-treated magnesium silicate is obtainedafter aged; the nano-alumina sol and the pretreated magnesium aluminum silicate are ground to obtain nano-powder slurry; and the nano-powder slurry is mixed with iron-red powder, mica powder, aluminumsilicate fibers and other half of water into the dispersing kettle to be dispersed. The preparation method is simple and reasonable in process, and safe and environment-friendly; the prepared coatingis simple and reasonable in components, and low in production cost; and an external coating mode is adopted during use, so that the operation is simple and reliable, and the time and the labor are saved.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a water-based coating for preventing casting veins and a preparation method thereof. Background technique [0002] With the rapid development of social economy, the popularity of automobiles is getting higher and higher. The core component of a car is the engine. Among them, during the production process of the engine, the veining and sinking of the intake port and exhaust port often appear. Veining will hinder the vortex characteristics of the intake and exhaust passages, affect the performance of the engine, and in severe cases will cause severe engine castings to be scrapped. [0003] A large number of studies and long-term casting practice have shown that the root cause of the veining on the surface of castings is that the thermal stress caused by the phase transformation and expansion of silica sand at 573 °C leads to cracks on the surface of the sand core and the penetration of mo...

AI Technical Summary

Problems solved by technology

[0004] At present, the measures to prevent veining in the production of engine castings include: 1. Some or all of the non-siliceous special sand, such as pearl sand, chromite sand, zircon sand, etc., has the disadvantage of high cost; 2. Add A certain proportion of anti-veining additives can reduce or eliminate veining to a certain extent, but the actual operation of adding anti-veining additives to silica sand is cumbersome, time-consuming and laborious. At the same time, the anti-veining additives currently on the market are complex and The manufacturing process is cumbersome and pollutes the environment, and the price is still relatively high, which makes the production cost of casting manufacturers high when using these anti-veining additives

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