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WSS M3P36 A1 Phosphate Coating

This document outlines the specifications for phosphate coatings applied to automotive components, detailing both light (WSS-M3P36-A1) and heavy (WSS-M3P36-A2) coatings. It specifies requirements for coating weight, physical properties, adhesion, corrosion protection, and paint application. The document also includes a summary of revisions made to the specifications.

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603 views2 pages

WSS M3P36 A1 Phosphate Coating

This document outlines the specifications for phosphate coatings applied to automotive components, detailing both light (WSS-M3P36-A1) and heavy (WSS-M3P36-A2) coatings. It specifies requirements for coating weight, physical properties, adhesion, corrosion protection, and paint application. The document also includes a summary of revisions made to the specifications.

Uploaded by

harungul1208
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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ENGINEERING MATERIAL SPECIFICATION

PHOSPHATE COATING, LIGHT WSS-M3P36-A1

PHOSPHATE COATING, HEAVY WSS-M3P36-A2

1. SCOPE

These specifications define a phosphate coating applied to automotive components.

2. APPLICATION

These specifications were released originally for a coating generally specified for steel parts where
good adhesion and intermediate corrosion resistance is required. The coating provides a clean,
grease-free surface for painting, improves adhesion of the paint film, and inhibits the spread of
corrosion when the paint film is broken. Parts phosphated in accordance with WSS-M3P36-A2 may be
oiled instead of painted to provide short-term rust protection.

3. REQUIREMENTS

3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS

Material suppliers and part producers must conform to the Company's Standard Requirements
For Production Materials (WSS-M99P1111-A).

3.2 PHYSICAL PROPERTIES

3.2.1 Coating Weight


(FLTM AQ 101-01, AQ 101-02, or AQ 101-03)

Note: When phosphate solutions with high Nickel of Manganese contents are in use,
the chromic acid test (FLTM AQ 101-01) should be used.

3.2.1.1 Coating weights (dip or spray system), min.

A1
All substrates 1.5 g/m²

A2
All substrates 11.0 g/m²

3.2.2 Crystal size, max 25 microns

Measurements conducted with 1000 magnification SEM’s.

Date Action Revisions Rev 01

2013 01 09 Revised Removed test method from Sec. 3.3 C. Mracna, NA


2003 08 14 Activated J. M. Showalter
Controlled document at www.MATS.ford.com Copyright © 2013, Ford Global Technologies, Inc. Page 1 of 2
ENGINEERING MATERIAL SPECIFICATION

WSS-M3P36-A1/A2

3.3 RESISTANCE PROPERTIES

Adhesion (bend test) No loss of adhesion at bend


(FLTM BI 009-05)

3.4 CORROSION PROTECTION

By agreement between Ford and the supplier, parts phosphated in accordance with this
specification may be oiled to provide short-term rust protection during shipment.

3.5 PAINT APPLICATION

If the phosphate coating is being utilized as a base for paint then the paint shall be applied
immediately following the phosphate application.

4. GENERAL INFORMATION

The information given below is provided for clarification and assistance in meeting the requirements of
this specification. Contact gmfs@ford.com for questions concerning Engineering Material Specifications.

5. SUMMARY OF REVISIONS

2013 01 09 Removed test method from Sec. 3.3

Copyright © 2013, Ford Global Technologies, Inc. Page 2 of 2

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