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topic 30012

Coating for cast iron to resist molten aluminum

A discussion started in 2004 & continuing through 2017 . . .


Q. We are using cast iron thermocouples to sense the Aluminium metal temperature. That cast iron body will be always inside the furnace which has 680 °C metal, and the cast iron body is getting melted within 48 hours. Is there is any corrosive resistant coating available to protect cast iron body under this circumstance to increase its life?

K. Annamalai
plating shop - Chennai, Tamil Nadu, India

Boron Nitride

Boron Nitride

A. You may want to try a Boron Nitride coating. It's available in a spray or may be brushed on like paint. Boron Nitride will resist wetting by molten Aluminum and Al Alloys, it will be effective to about 2000 °C.

Good luck & Best regards,

Jim Sivertsen
Refining & Alloys - Alden, New York


Thermocouple tubes are being coated with Boron Nitride Coatings in India to extend the life of the tubes.


Mr. Manoj Saraf
- Kolkata, India


Effects of Stellite-6 Coating on Properties of Stainless Steel

Dear Sir,

Stellite 6 coating can very well withstand that temperature and thermowell shall not have any problem.

- Pune, Maharashtra, India

Best coating for steel trough carrying molten aluminum

May 19, 2017

Q. We have a steel trough that we use to help pour molten aluminum from a bull ladle into a holding furnace at the die cast machine. We eat through a trough in less than a month. What coating could we use to help prevent the aluminum from destroying our troughs.

Alex Lubich
Co-op student - Brooklyn Center, Minnesota, us

May 23, 2017

A. The only coating that I can think of with a budget in mind that can withstand molten aluminum like a champ is Graphite.

Try an anti slip graphite coating on the inside of the steel trough; it can be sprayed or rolled/brushed.

Marvin Sevilla
- Managua, Nicaragua

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