Comparison between different treatments of kaolin in anticorrosive paint formulations

What is it about?

Kaolin is alumino-silicate clay which is rich in alumina. Kaolin was treated thermally to be transferred to m-kaolinite which is more active, then another chemical treatment was done using ammonium molybdate to transfer the alumina from its present gamma-phase to more stable phase which is the alpha-alumina that is very hard and is not affected by the surrounding medium. Chemically treated kaolin was the most efficient than thermally treated kaolin and both were better than kaolin.

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Why is it important?

Simple addition of ammonium molybdate traces can change kaolin from phase to more stable phase that can make it more efficient in protecting cold-rolled steel structures from corrosion. Kaolin is cheap extender that give high build to paint films and its treatment either thermally or chemically can make it perform more efficiently in anticorrosive alkyd based-paint formulations.