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Zinc Phosphate Coating

Phosphate Coating on Plated Bolts for Naval Application

Zinc phosphate coating was plated on these 4140 steel CT stud bolts and supplied to the customer's location in West Virginia. Rust and dirt in bolts were cleaned in line with TT-C-490 standards. The bolts, intended for naval applications, were coated in conformance with MIL-DTL-16232 standards to retain rust prevention oil. Alkaline De-Rusting was performed on the plated bolts with rust prevention oil for higher corrosion resistance. A special 2-piece inspection process was conducted to ensure that the bolts did not have rust or soil. Parts were fine-grained according to customer requirements and a mercury-free statement was provided for the plating. Government priority rating of DOA3 was assigned on these bolts and we delivered them within a week after a thorough visual as well as thickness inspection.

Specifications

Capabilities Applied/Processes	Phosphate Coating , Type Z, Class 3 Alkaline De-Rusting with rust prevention oil
Base Material	4140 Steel (Chromoly)
Material Finish	Zinc Phosphate
Secondary Operations Applied	2-piece inspection for rust and soils, visual and thickness inspection
Industry for Use	Military (Navy)
Volume	60 pieces
Total Product Weight	45 lbs
Delivery Time	7 days
Delivery Location	West Virginia (WV)
Standards Met	MIL-DTL-16232 Phosphate Coating, Heavy, Zinc Base (MIL-P-16232D, DOD-16232, DOD-P-16232) TT-C-490 Cleaning Methods for Ferrous Surfaces and Pretreatments for Organic Coatings
Special Instructions	Mercury free statement required, Government Priority Rating DOA3, Parts must be fine grained and not powdery
Product Name	CT Stud Bolt
Project Description	This project required the cleaning of CT Stud Bolts for rust and dirt. Once cleaned, the bolts were zinc phosphate plated for use in a naval application.