ENGINEERING MATERIAL SPECIFICATION
Material Name Specification Number
PLATING, ZINC/IRON OVER FERROUS SURFACES WSF-M1P89-A1/A2
1. SCOPE
This specification defines performance requirements for an
electrolytically deposited alloy coating of zinc/iron.
2. APPLICATION
This specification was released originally to define performance
requirements for zinc/iron alloy coatings where corrosion protective
and/or decorative finishes on ferrous surfaces are required.
A supplementary surface treatment (e.g., chromate finish per
specification WSB-M10P10-A1/A5) must be applied to coated parts to retard
formation of white corrosion products.
3. REQUIREMENTS
All requirements identified for each specification must be met to achieve
acceptable field durability. No one requirements, exclusive of others,
is capable of ensuring satisfactory performance. Any deviations to the
requirements of these specifications may be subject to additional
performance requirements.
3.1 QUALITY SYSTEM REQUIREMENTS
Material suppliers and part producers must conform to Quality
System Requirements, QS-9000. Material specification requirements
are to be used for initial qualification of materials. A Control
Plan for ongoing production verification is required. This plan
must be reviewed and approved by the relevant Ford Materials
activity and/or Ford Supplier Technical Assistance (STA) prior to
production parts submission. Appropriate statistical tools must
be used to analyze process/product data and assure consistent
processing of the materials.
Part producers using this material in their products, must use
Ford approved materials and must conform to a process control plan
which has been approved by STA and/or the relevant Materials
Activity.
Date Action Revisions
1999 11 30 Revised Revised para 3.2 A. Vallabhanath A. Novakovic
1993 01 11 NGA1E10269519000 Released A. Vallabhanath A. Novakovic
WP 3948-a Page 1 of 4
ENGINEERING MATERIAL SPECIFICATION WSF-M1P89-A1/A2
3.2 PLATING THICKNESS AND CORROSION RESISTANCE
(ASTM B 659/ASTM B 117/ASTM B 487)
Plating thickness requirements identified represent minimum values
and apply to all significant surfaces unless otherwise specified on
the Engineering Drawing.
Note: In case of dispute, the thickness measurement umpire method
shall be metallographic sectioning per ASTM B 487.
Evidence of basis metal red rust corrosion products on significant
surfaces following testing when evaluated by the unaided eye at
normal reading distance constitutes failure of the part.
Evidence of zinc/iron alloy white corrosion products on significant
surfaces following salt spray testing when evaluated by the unaided
eye at normal reading distance constitutes failure of the part due
to breakdown of the supplementary surface treatment. This
requirement applies to all supplementary surface treatments and
supersedes any conflicting requirements governing supplementary
surface treatments unless otherwise specified on the engineering
drawing.
BARREL PLATED
Specification Plating Chromate Salt Spray Hours
Number Thickness Color White Corrosion Red
Corrosion
micrometres, min min min
WSF-M1P89-A1 5 Yellow/Iridescent 96 240
WSF-M1P89-A1 5 Black (Silver Free) 72 336
WSF-M1P89-A2 8 Yellow/Iridescent 96 480
WSF-M1P89-A2 8 Black (Silver Free) 72 552
RACK PLATED
Specification Plating Chromate Salt Spray Hours
Number Thickness Color White Corrosion Red
Corrosion
micrometres, min min min
WSF-M1P89-A1 5 Yellow/Iridescent 96 336
WSF-M1P89-A1 5 Black (Silver Free) 72 552
WSF-M1P89-A1 5 Black (Silver Chromate) 72 336
WSF-M1P89-A2 8 Yellow/Iridescent 96 960
WSF-M1P89-A2 8 Black (Silver Free) 72 1440
WSF-M1P89-A2 8 Black (Silver Chromate) 72 960
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ENGINEERING MATERIAL SPECIFICATION WSF-M1P89-A1/A2
3.3 IRON CONTENT
The iron content in the deposited layer shall be 0.3 - 0.8 % by
weight. Suitable methods for determining the iron content include
Inductively Coupled Plasma (ICP), Directly Coupled Plasma (DCP) or
other spectrographic techniques, such as Atomic Absorption. The
above test performed on representative coupons in rack plate
applications and on solid sphere or rod sections in barrel
applications. The basis metal for testing shall be brass.
3.4 PLATING ADHESION
(ASTM B 571)
Adhesion of the electroplate to the base metal must conform to the
requirements of the following test methods per ASTM B 571 unless
otherwise indicated.
3.3.1 Grind-Saw Test
No lifting or peeling of the electroplate from the substrate is
permitted following the grind-saw test.
3.3.2 Burnishing Test
No blistering, lifting, or peeling of the electroplate from the
substrate is permitted following the burnishing test.
3.5 EMBRITTLEMENT
Parts plated to this specification shall be free from the
detrimental effects of hydrogen embrittlement or other factors
which result in part brittleness. All parts shall meet the
requirements of WSS-M99A3-A.
3.5.1 If hydrogen embrittlement relief via heat treatment is
specified, post treatments will be performed after heat
treatment.
3.6 SUPPLIER'S RESPONSIBILITY
All materials supplied to this specification must be equivalent in
all characteristics to the material upon which approval was
originally granted.
Prior to making any change in the properties, composition,
construction, color, processing or labeling of the material
originally approved under this specification, whether or not such
changes affect the material's ability to meet the specification
requirements, the Supplier shall notify Purchasing, Toxicology and
the affected Materials Engineering activity of the proposed
changes and obtain the written approval of the Materials
Engineering activity. Test data, test samples and a new code
identification are to be submitted with the request.
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ENGINEERING MATERIAL SPECIFICATION WSF-M1P89-A1/A2
Substance restrictions imposed by law, regulations or Ford, apply
to the materials addressed by this document. The regulations are
defined in Engineering Materials Specification WSS-M99P9999-A1.
4. APPROVAL OF MATERIALS
Materials defined by this specification must have prior approval by
the responsible Materials Engineering activity. Suppliers desiring
approval of their materials shall first obtain an expression of
interest from the affected Purchasing, Design and Materials
Engineering activity. Upon request, the Supplier shall submit to the
affected Materials Engineering activity a completed copy of their
laboratory test reports, signed by a qualified and authorized
representative of the test facility, demonstrating full compliance
with all the requirements of this specification (test results, not
nominal values), the material designation and code number, and test
specimens for Ford evaluation. Ford's engineering approval of a
material will be based on its performance to this specification and
on an assessment of suitability for intended processes and/or
applications. Upon approval, the material will be added to the
Engineering Material Approved Source List.
5. GENERAL INFORMATION
The information below is provided for clarification and assistance in
meeting the requirements of this specification.
5.1 SIGNIFICANT SURFACES
Unless otherwise specified on the engineering drawing, significant
surfaces are defined as those surfaces of the finished part that:
. Are directly visible and/or visible by reflection when the
finished part is assembled in position.
. Can be the source of corrosion products directly visible or
visible by reflection.
5.2 CHROMATE CONVERSION COATINGS
Special finishes may be required on some parts, in which case the
Engineering Drawings will be marked accordingly. Zinc/iron plate*
plus chromate treatment; or zinc/iron plate* plus black finish.*
*Example: Zinc/iron plate per WSF-M1P89-A1 plus iridescent/yellow
chromate to WSB-M10P10-A3.
*In barrel operations the black post treatment may vary from dark
greenish black, to slight iridescent black to total black just
as long as the corrosion value requirements are met.
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