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WSS-M21P17-B1


ENGINEERING MATERIAL SPECIFICATION
Material Name Specification Number

CORROSION PROTECTIVE COATING, ELECTROLYTIC ZINC PLATE, TRIVALENT CHROMIUM, LEACHED AND SEALED CORROSION P

ROTECTIVE COATING, MECHANICAL ZINC PLATE, TRIVALENT CHROMIUM, LEACHED AND SEALED CORROSION PROTECTIVE COATING, ELECTROLYTIC ZINC PLATE, TRIVALENT CHROMIUM, LEACHED AND SEALED, INTEGRAL TORQUE CONTROL LUBRICANT CORROSION PROTECTIVE COATING, MECHANICAL ZINC PLATE, TRIVALENT CHROMIUM, LEACHED AND SEALED, INTEGRAL TORQUE CONTROL LUBRICANT CORROSION PROTECTIVE COATING, ELECTROLYTIC ZINC PLATE, TRIVALENT CHROMIUM, FRICTION MODIFIED INTEGRAL TORQUE CONTROL SEALER 1. SCOPE

WSS-M21P17-B1 WSS-M21P17-B2 WSS-M21P17-B3

WSS-M21P17-B4

WSS-M21P17-B5

This specification defines the performance of an electrolytic or non-electrolytic plating of zinc, followed by a trivalent chromium conversion, leached to a silver-white color in a sealer. 2. APPLICATION This specification was originally released for coatings where resistance to corrosion is required for fasteners and fuel injector components. These coatings are effective for preventing galvanic corrosion of steel fasteners that contact magnesium or aluminum components. Caution: These coatings are not recommended for severe abrasion conditions or where chip resistance is required. 2.1 SERVICE APPLICATION 2.1.1 2.1.2 The maximum service temperature resistance of these coatings is 120 °C. Electrical Conductivity

Date 2003 02 12 2003 01 27 2000 09 07

Action Revised Revised Activated Added B5 and updated

Revisions Rev chromate to chromium (III) B. Burnside/D. Drobnich D. Drobnich G. Weber
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Copyright ? 2003, Ford Global Technologies, Inc.

Printed copies are uncontrolled

ENGINEERING MATERIAL SPECIFICATION
3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS

WSS-M21P17-B1/B5

Material suppliers and part producers must conform to the Company's Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 APPEARANCE 3.2.1 The plating shall be smooth, fine grained, adherent, and free from blisters, pits, nodules, indications of burning, and other defects. All details of workmanship shall conform to the best practice for high quality plating. Parts shall have a silver-white color.

3.2.2 3.3

PERFORMANCE CHARACTERISTICS Items to be tested for adhesion, plating thickness, or corrosion testing shall be air cured for 24 h prior to testing. 3.3.1 Adhesion Mechanically Plated Parts Only (B2 & B4) Parts heated to 100 °C for 30 minutes shall exhibit no blistering, peeling, or flaking of plating that can be removed by a filament type tape. The testing of plate quality by salt spray and/or determination of coating thickness shall be done on parts passing the adhesion test. 3.3.2 Plating Thickness, min (ASTM B 659, ASTM B 487) 8 micrometers

The plating thickness requirement identified above represents the minimum value and applies to all significant surfaces unless otherwise specified on the Engineering Drawing. In case of dispute, the thickness measurement umpire method shall be metallographic sectioning per ASTM B 487. 3.3.3 Corrosion Resistance (SAE/USCAR-1, ASTM B 117) 3.3.3.1 Fasteners shall be tested and evaluated in accordance with SAE/USCAR-1, both in the as-plated, trivalent chromium and sealed condition (as-processed) and after being held at 120 °C for 4 hours (baked), and shall pass the number of hours specified in the table below. See WX100 for additional information.

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Copyright ? 2003, Ford Global Technologies, Inc.

ENGINEERING MATERIAL SPECIFICATION
3.3.3.2

WSS-M21P17-B1/B5

Parts other than fasteners shall be tested in accordance with ASTM B117, both in the as-plated, trivalent chromium and sealed condition (as-processed) and after being held at 120 °C for 4 hours (baked). Parts shall show no single ferrous corrosion spot larger than 1.5 mm in diameter, and shall not exhibit ferrous corrosion overall exceeding 0.1%, per ASTM D 610, grade 8, after the number of test hours specified in the table below. RED CORROSION As-Processed Baked 384 360 240 TBD 384 360

B1 & B3 B2 & B4 B5 3.4

WHITE CORROSION As-Processed Baked 96 72 96 72 96 72

EMBRITTLEMENT (WSS-M99A3-A) Parts processed to this specification shall be free from the detrimental effects of hydrogen embrittlement or other factors which result in brittleness. All parts shall meet the requirements of WSS-M99A3-A. 3.4.1 If hydrogen embrittlement relief via heat treatment is specified, post treatments will be performed after heat treatment.

4.

GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 4.1 REFERENCE DOCUMENTS The following documents are referenced in this specification: ASTM B 117 ASTM B 487 ASTM B 659 4.2 ASTM D 610 QS-9000 SAE/USCAR-1 WSS-M99A3-A WSS-M99P9999-A1 WSS-M99P1111-A

WORLDWIDE FASTENER COATINGS When used for Worldwide Standard Parts, the Worldwide Fastener Coating suffix for WSS-M21P17-B3 is S437, and the suffix for WSS-M21P17-B4 is S437M.

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Copyright ? 2003, Ford Global Technologies, Inc.


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