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This specification establishes the basic requirements for non-electrolytically applied zinc-flake composite corrosion protective coating systems for fasteners. The requirements apply to appearance, adhesion, corrosion resistance, blisters, thread fit, hydrogen embrittlement, and total coefficient of friction. The coating systems covered by this specification do not contain hexavalent chromium, lead, cadmium, or mercury. This specification is intended for corrosion protection of inch and metric series threaded fasteners as well as for non-threaded fasteners such as washers and pins. This specification also covers test methods, application, inspection, and certification.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers the basic requirements for non-electrolytically applied zinc-flake composite corrosion protective coating systems for fasteners (See ).
Note 1: The coating systems do not contain hexavalent chromium, lead, cadmium, or mercury.
1.2 This specification is intended for corrosion protection of inch and metric series threaded fasteners with minimum nominal diameters of 0.250 in. for inch series and [6.00 mm] for metric as well as for non-threaded fasteners such as washers and pins.
1.3 This coating system may be specified to consist of a zinc-flake basecoat, or a zinc-flake basecoat and topcoat (See ).
Note 2: For threaded fasteners, the coating system will typically consist of a zinc-flake basecoat and topcoat.
1.3.1 The basecoat is a zinc-rich material containing aluminum flakes dispersed in a compatible liquid medium. The zinc-flake basecoat may be specified to contain integral lubricant.
1.3.2 Topcoats may be organic or inorganic in composition depending upon the specified requirements.
188.8.131.52 Organic topcoats consist of polymer resins, aluminum, dispersed pigments, and are colored in their applied state.
184.108.40.206 Inorganic topcoats consist of water-dispersed silicate compounds and are transparent in their applied state.
220.127.116.11 Topcoats contain integral lubricants and are applied in conjunction with zinc-flake basecoats to form a coating system with enhanced performance attributes such as increased corrosion resistance, total coefficient of friction properties, chemical resistance, and color.
1.4 These zinc-flake basecoats and topcoats are applied by conventional dip-spin, dip-drain, or spray methods to fasteners which can be handled through a cleaning, coating, and curing operation. The maximum curing temperature is 482°F [250°C].
1.5 The friction properties of the coating system may be determined by a standard test to verify process control or by a part specific test which requires the purchaser to establish and communicate technical criteria.
1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B117 Practice for Operating Salt Spray (Fog) Apparatus
B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section
B499 Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals
B568 Test Method for Measurement of Coating Thickness by X-Ray Spectrometry
D610 Practice for Evaluating Degree of Rusting on Painted Steel Surfaces
D3359 Test Methods for Measuring Adhesion by Tape Test
E376 Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Testing Methods
F606 Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets
F606M Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, and Rivets (Metric)
F788 Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
F1624 Test Method for Measurement of Hydrogen Embrittlement Threshold in Steel by the Incremental Step Loading Technique
F1789 Terminology for F16 Mechanical Fasteners
F1940 Test Method for Process Control Verification to Prevent Hydrogen Embrittlement in Plated or Coated Fasteners
International Organization for Standardization (ISO)ISO 16047 Fasteners - Torque/clamp force testing
ICS Number Code 87.040 (Paints and varnishes)
UNSPSC Code 23153800(Coating systems)
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ASTM F3019 / F3019M-14, Standard Specification for Chromium Free Zinc-Flake Composite, with or without Integral Lubricant, Corrosion Protective Coatings for Fasteners, ASTM International, West Conshohocken, PA, 2014, www.astm.orgBack to Top