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How to solve the problem of insufficient coating thickness?
Release time:
2023-05-12
During the construction process of water-based paint, there are sometimes situations where the coating thickness is insufficient. The main reasons for this problem are the following three aspects: 1. The coating does not form enough coating thickness and flows directly. 2. The coating is fully penetrated into the molding sand, resulting in insufficient coating thickness. 3. The surface of the sand mold is coated with a release agent, which reduces the permeability of the coating and directly affects the coating thickness. Specific solutions: 1. Increase the viscosity of the coating (maximum value not exceeding 7S) to improve the coating adhesion and avoid excessive flow of the coating; 2. Improving the solidity of sand molds can effectively prevent excessive penetration of coatings; 3. Grind off the mold release agent on the surface of the pattern with fine sandpaper before applying flow coating. 4. The wet thickness requirement for the coating of cast iron parts: generally, the thickness for thin-walled castings is 0.15~0.30mm. Medium size castings range from 0.30 to 0.75mm, thick walled castings range from 0.75 to 1.00mm, and extra thick castings range from 1.00 to 2.00mm.
During the construction process of water-based paint, there are sometimes situations where the coating thickness is insufficient. The main reasons for this problem are the following three aspects: 1. The coating does not form enough coating thickness and flows directly. 2. The coating is fully penetrated into the molding sand, resulting in insufficient coating thickness. 3. The surface of the sand mold is coated with a release agent, which reduces the permeability of the coating and directly affects the coating thickness.
Specific solutions: 1. Increase the viscosity of the coating (maximum value not exceeding 7S) to improve the coating adhesion and avoid excessive flow of the coating; 2. Improving the solidity of sand molds can effectively prevent excessive penetration of coatings; 3. Grind off the mold release agent on the surface of the pattern with fine sandpaper before applying flow coating. 4. The wet thickness requirement for the coating of cast iron parts: generally, the thickness for thin-walled castings is 0.15~0.30mm. Medium size castings range from 0.30 to 0.75mm, thick walled castings range from 0.75 to 1.00mm, and extra thick castings range from 1.00 to 2.00mm.
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