SECTION 719 - METAL COATINGS
719-01 Galvanized Coatings and Repair Methods
SCOPE. These specifications cover the galvanized coatings applied to various materials and the repair thereto. MATERIAL REQUIREMENTS. Materials shall be galvanized in accordance with the specification indicated by Type on the plans or in the specifications.
A.Type I. ASTM A123 Zinc (Hot-Dip Galvanized) Coating on Iron and Steel Products.
B.Type II. ASTM A153, Zinc Coating (Hot Dip) on Iron and Steel Hardware. As an alternate to the hot dip method of ASTM A153, nuts, bolts, washers and other miscellaneous hardware, approved by
719-01 Galvanized Coatings and Repair Methods
NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 700 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 4 the Engineer, may be mechanically galvanized. The mechanically zinc-coated product(s) shall conform to the applicable coating thickness, adherence and quality requirements of ASTM A153. Mechanically zinc-coated nuts for assembly with mechanically zinc-coated bolts shall be tapped oversize prior to coating and need not be re-tapped afterwards.
C.Type III. ASTM A123 Zinc (Hot-Dip Galvanized) Coating on Iron and Steel Products, except as modified herein. A minimum weight of coating (oz/ft2 of surface) for base metal less than 1/16 inch thickness shall be as follows: Average of Specimen Any Individual Specimen or Computed Value 1.5 1.25
D.Type IV. ASTM A653/A653M, Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process, Coating Designation G 210 unless otherwise specified.
E.Type V. Flame Sprayed Coating System.
1.Preparation of Base. Those areas to be coated shall be sand blasted with silica sand or crushed garnet of such gradation that sand shall be mesh size 20 to 40 with a minimum of 40% retained on a No. 30 mesh screen (U.S. Standard Sieve series). Pressure of not less than 75 psi shall be maintained at the blast generator. A sample steel plate shall be blasted until the surface cannot be further cleaned or roughened. This plate shall be used for visual comparison and any areas that do not meet this standard as to roughness or cleanliness shall be reblasted.
2.Zinc Application. The wire used in spraying shall be 15 ga., 1/8 inch or 3/16 inch diameter, zinc 99.0% purity. Air pressure at the Air Control Unit shall be 60 psi and there shall be no more than 35 feet of 3/8 inch I.D. hose between the Air Control Unit and the gun. The metal coating shall be applied at a minimum thickness of 3 mils. At least one coating shall be applied within 4 hours of blasting and the surface must be completely coated within 8 hours of blasting. The specified thickness of coating shall be applied in multiple layers and in no case shall less than two passes be made over every part of the surface.
3.Finish Coat. The zinc coating shall be given a finish coating consisting of two coats of Aluminum Vinyl sealer. This sealer shall consist of a volatile vehicle containing a minimum of 20% Vinyl Copolymer and plasticizer and a minimum of 10% Non-Leafing Aluminum Flake. REPAIR. The Contractor shall be required to repair damaged areas of galvanized zinc coating. Damage may result from wet storage (white rust), welding or cutting (flame), or from excessive rough handling during shipping or erection. In general, only field repairs will be allowed. Shop repairs shall only be permitted when the total area of damage on any single piece is less than 2% of the coated surface or 16 square inches, whichever is less. Any coated piece on which the total area of damage exceeds these amounts in the shop shall be rejected. Materials for field repair shall be selected from Department=s Approved List of Galvanized Repair Materials. Zinc solders shall be zinc-cadmium and zinc-tin-lead alloys supplied in stick or paste form, and that liquidize for application at temperature ranges of from 518 to 527OF and 446 to 500OF, respectively. Zinc paints shall contain not less than 65% zinc dust (by weight) in the dried paint film and shall meet current standards for the emission of volatile organic compounds. Detailed requirements for the approval of galvanized repair materials are available from the Materials Bureau. Corrosion deposits shall be removed in a manner satisfactory to the Department prior to incorporation of the material in the work. After removal of these deposits, the coating shall have a uniform appearance free from uncoated spots, lumps, blisters, gritty areas, acid, flux and black spots. Materials with these
719-02 Aluminum Anodic Coatings
NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 700 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 4 defects will be rejected and shall be immediately removed from the worksite. Acceptable material shall be provided to replace rejected material at no additional expense to the State. Damaged areas of loose and deteriorated galvanized zinc coating shall be cleaned by power sanding, power grinding, or abrasive blast cleaning to bright metal. If zinc solder is used for repairs the cleaned area shall be preheated in accordance with the manufacturers instructions for use. The heated surface shall then be rubbed with a repair stick to evenly distribute a layer of zinc alloy, or if zinc paste is used it shall be spread evenly using a spatula or similar tool. Zinc solder shall be deposited in a uniform layer at a minimum dry film thickness of 3 mils. If zinc paint is used for repairs it shall be applied in accordance with the manufacturers instructions for use, using a brush or by spray methods. Zinc paint shall be applied in such quantity as to produce a minimum dry film thickness of 3 mils. BASIS OF ACCEPTANCE. The acceptance of galvanized coating and repairs is included in the acceptance of the materials receiving the coating.
719-02 Aluminum Anodic Coatings
SCOPE. This specification covers the material requirements for Anodic Coatings for Aluminum and Aluminum Alloys. TABLE 719-02-1 MINIMUM COATING THICKNESS AND WEIGHT Coating Designation Sealed with Minimum Coating Thickness, mil Minimum Coating Weight (mg/in2) Alloys 1100, 3003, 5052, 5005, 5357, 5457, 6463, 6563, 6061, 6063 Alloys 2014, 2024 Type 202 Boiling water 0.3 14.0 7.0 Type 302 Nickel Acetate 0.3 14.0 --- Type 204 Boiling water 0.4 21.0 11.0 Type 205 Chromate 0.2 --- --- Type 210 Chromate 0.4 --- --- Type 215 Boiling water 0.8 40.0 17.0 Type 226 None required 2.0 86.0 66.0 MATERIAL REQUIREMENTS. Anodic coatings for Aluminum and its alloys shall conform to the requirements of Table 719-02-1 for the coating designation shown on the plans or in the proposal:
719-03 Aluminum Coating (Hot Dip)
SCOPE. This specification covers the material requirements for hot dip aluminum coatings applied to steel appurtenances in contact with aluminum surfaces, or where applied as shown on the contract plans. MATERIAL REQUIREMENTS. The material used shall be 99 percent pure aluminum conforming to the specifications for Aluminum Alloy Number 1100 according to ANSI H 35.1. Thickness of the coating shall not be less than 2 mils on any individual specimen and the average of the specimens tested shall not be less than 2.3 mils. The thickness of coating may be determined by the use of a Magna-Gage. The aluminum coating on threads, except on topped threads, shall not be subjected to a cutting, rolling, or finishing tool operation, unless specifically authorized by the Engineer.
719-99 for Site Manager Use
NEW YORK STATE DEPARTMENT OF TRANSPORTATION Section 700 STANDARD SPECIFICATIONS (USC) January 1, 2026 VOLUME 4 The coating shall be continuous and uniform in thickness. The coating shall adhere tenaciously to the surface of the base metal. When the coating is cut or pried into, such as with a stout knife applied with considerable pressure in a manner tending to remove a portion of the coating, it shall only be possible to remove small particles of the coating by paring or whittling, and it shall not be possible to peel any portion of the coating so as to expose the steel. The aluminum coated articles shall be free from uncoated spots and other defects not consistent with good aluminum coating practice.
719-99 for Site Manager Use
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Source: Standard Specifications (US Customary Units), 2026 (Jan) Edition. Pages 1319–1322 of 1,489. View official source ↗