Surfix Fe 691 / 695 Description Application: An iron phosphating chemical process for spray or immersion application on Mild Steel, Galvanised Steel and Aluminium. The Growel Advantage: This treatment converts metal surface to an amorphous iron phosphate coating, which increases corrosion resistance, adhesion and durability of paint finishes. These products can also be combined with Surklin 112, belonging to the family of biodegradable surfactants, as a cleaner/coater system. get a quote