Carbon Steel Coating For Lost Foam Casting With High Temperature Resistance And Excellent Surface Finish

4. Carbon Steel Coating

The carbon steel coating is a functional coating material specifically developed for carbon steel substrates. Its primary function is to isolate carbon steel from air, moisture, and acidic or alkaline media, thereby preventing rust and corrosion. At the same time, it can impart additional properties such as surface aesthetics and wear resistance. The coating is widely used in fields such as machinery manufacturing, steel structures for construction, pipelines, and automotive components.

Features:

1.Compatibility with Carbon Steel Pouring Conditions

With a refractoriness of 1600–1700 °C, the coating is well matched to the pouring temperature of carbon steel (1450–1520 °C). Common refractory aggregates include quartz powder and bauxite, providing strong resistance to molten steel erosion and effectively preventing sand burn-on.

2.Low Gas Generation to Prevent Porosity

The binder system (e.g., CMC combined with bentonite) exhibits low moisture absorption and minimal gas evolution after drying. With properly controlled permeability, it enables the timely discharge of gases generated during foam pattern vaporization, reducing subsurface porosity and related defects.

3.Strong Adhesion with Easy Cleaning

The coating demonstrates good hang-on performance and remains crack-free and firmly bonded after drying. After pouring, it peels off in a shell-like form, leaving a smooth casting surface and ensuring high cleaning efficiency.

4.Flexible Processing with Cost Efficiency

Recommended water-to-powder ratio: approximately 1:0.6–0.7. The coating can be applied by dipping, pouring, or brushing, with a coating thickness of 0.8–1.2 mm. The dry powder offers a long shelf life and can be easily prepared by adding water, making it suitable for batch production of various carbon steel castings such as structural components, brackets, and machinery parts.