Phosphated
/glossary/phosphatedSurface treated with phosphate coating for corrosion resistance and lubricant retention.
In detail
Phosphating is a chemical surface treatment that converts steel surface into an insoluble phosphate coating (typically manganese or zinc phosphate). The crystalline coating provides corrosion protection during storage, improves paint adhesion, and retains lubricating oil for subsequent forming operations. Phosphated tubes are specified for hydraulic systems (oil retention), automotive components, and as a pretreatment before painting or powder coating. The process follows cleaning and acid pickling in the surface preparation sequence.
Where you'll meet this in procurement
You will meet Phosphated in manufacturing notes, surface-finish call-outs, and precision-tube RFQs. Confirm that Phosphated is required for the duty (tolerance, bore finish, or coating), and that the quote states the same process the inspector will verify on receipt.