Cosslett process

Cosslett process

[′käs·lət ‚präs·əs]
(metallurgy)
A process in which iron or steel articles immersed for 3 or 4 hours in a boiling solution, made by mixing iron filings with concentrated phosphoric acid, H3PO4(sufficient to form a paste), and then adding to weak phosphoric acid, become coated with a rust-resisting deposit of basic ferrous phosphate.