High-bonding force water-based EPC paint for magnesium alloy casting and preparation method thereof

Abstract

The invention discloses high-bonding force water-based EPC paint for magnesium alloy casting. The high-bonding force water-based EPC paint is prepared from the following raw materials in parts by weight: 40 to 50 parts of quartz powder, 10 to 20 parts of heat-conducting modified kieselguhr, 2 to 3 parts of nano zinc oxide, 2 to 3 parts of sodium alginate, 2 to 5 parts of tetraethyl orthosilicate, 3 to 5 parts of calcium sulfate whiskers, 0.1 to 0.2 part of sodium fluorosilicate, 0.1 to 0.2 part of zinc borate, 0.1 to 0.2 part of sodium lignin sulfonate, 20 to 30 parts of absolute ethyl alcohol, 30 to 50 parts of deionized water, and 5 to 10 parts of a diluted hydrochloric acid solution of which the concentration is 15 to 20%. According to the invention, a prepared paint coating has the advantages of breathability, thermal conductivity and environmental protection, defects of magnesium alloy castings can be effectively improved, and the quality of the magnesium alloy castings is improved.

Description

technical field [0001] The invention relates to the technical field of lost foam casting coatings, in particular to a high-adhesive water-based lost foam coating for magnesium alloy casting and a preparation method thereof. Background technique [0002] In recent years, magnesium alloys are gradually replacing part of iron and steel due to their excellent comprehensive properties, and have become more and more widely used materials, especially in the fields of automobiles and aviation, and lost foam casting magnesium alloy castings are also eye-catching The use of lost foam casting technology has the advantages of simple process, high casting dimensional accuracy, and small machining allowance. However, due to the low pouring temperature in the lost foam casting process of magnesium alloy castings, it is difficult to gasify the lost foam, and Most of the molds are in liquid state, and the magnesium metal is active, so it is easy to oxidize and burn, which eventually leads to...

AI Technical Summary

Problems solved by technology

"Development of Magnesium Alloy Coatings for Lost Foam Casting with Quartz Powder" uses quartz powder and diatomite as refractory aggregates, sodium bentonite and CMC as suspending agents, and dextrin and silica sol as binders to prepare high-permeability coatings. Magnesium alloy lost foam coating with flame retardant effect, however, the thermal conductivity of the coating formed during the casting process of this coating is poor, resulting in high temperature in the cavity, unsatisfactory flame retardant effect, and a large amount of combustion and oxidation of magnesium metal leads to serious defects in castings