Anti-molten aluminum corrosion coating and preparation method thereof

Abstract

The invention discloses an anti-molten aluminum corrosion coating. The coating is characterized by comprising at least three sub-coatings, namely the alloy layer arranged on the surface of a substratein a coating mode, a ceramic layer arranged on the surface of the alloy layer in a coating mode and a hole sealing layer arranged on the surface of the ceramic layer in a coating mode. The anti-molten aluminum corrosion coating has high-temperature abrasion resistance, aluminum sticking resistance, molten aluminum corrosion resistance, large bonding strength and excellent thermal shock resistance. Moreover, a preparation method of the anti-molten aluminum corrosion coating is easy to implement, coating materials are easy to obtain, and the production cost is reduced.

Description

Technical field [0001] The invention relates to an anti-melting aluminum corrosion coating and a preparation method thereof. Background technique [0002] Hot-dip aluminized silicon steel plate has good heat resistance, oxidation resistance and heat reflection performance. It can be used for a long time at 500℃, and can still reflect 80% of the radiant energy at this temperature. Under the same light conditions, its surface temperature is more Stainless steel is 90°C lower; and can maintain excellent corrosion resistance in sulfur-containing industrial atmosphere, marine atmosphere and humid environment. Therefore, in the automotive industry, construction industry, household appliances and new energy and other fields, hot-dip aluminized silicon steel plates have been widely used, such as car silencers, exhaust pipes, engine heat shields, various heat exchangers and photovoltaic solar energy Battery substrate, etc. [0003] The equipment for producing hot-dip aluminized silicon st...

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Problems solved by technology

However, there is a big difference between the two production conditions, and many problems will arise on the hot-dip aluminum-silicon production line: the aluminum liquid has poor plateability, and pinholes are prone to missing plating defects; the WC coating used for the hot-dip galvanized sink roll is The performance of the aluminum-silicon pot will be severely deteriorated, and it cannot adapt to the production conditions of aluminum-silicon plating; the temperature of the aluminum plating solution is high, around 680°C, and it is more corrosive to the components in the aluminum-silicon pot than hot-dip galvanizing; continuous The working temperature of the sinking roll on the aluminum-silicon plating production line is about 680°C. The aluminum and its oxides in the aluminum plating solution will adhere to the aluminum slag on the surface of the roll and corrode the molten aluminum to cause pits on the surface, which will affect the quality of the steel plate.

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