AASHTO M 300:2021 Standard Specification for Inorganic Zinc-Rich Primer.
This specification covers self-curing, inorganic zinc-rich primers fbr use on steel surfaces. InteidecI Use of tile Prin,e,c:
Types I and II are intended for use on bridges, similar structural steel, and other ferrous metal surfaces subject to corrosive atmospheric environments such as marine, industrial, and high humidity.
The values stated in SI units are to be regarded as the standard.
Reference to standard specifications, testing procedures, and other standard procedures contained in this document shall be the latest edition of the published document at the date of this specification.
2.1.1. AASIITO Standard:
• Standard Specifications for High way Bridges
2.1.2. ASTM Standards:
• A36/A36M, Standard Specification for Carbon Structural Steel
• B117, Standard Practice for Operating Salt Spray (Fog) Apparatus
• D185, Standard Test Methods for Coarse Particles in Pigments
• D512, Standard Test Methods for Chloride Ion In Water
• D520, Standard Specification for Zinc Dust Pigment
• D521, Standard Test Methods for Chemical Analysis of Zinc Dust (Metallic Zinc Powder)
• D562, Standard Test Method for Consistency of Paints Measuring Krebs Unit (KU) Viscosity Using a Stormer-Type Viscomctcr
• D610, Standard Practice for Evaluating Degree of Rusting on Painted Steel Surfaces
• D1475, Standard Test Method For Density of Liquid Coatings, Inks, and Related Products
• D1640, Standard Test Methods for Drying, Curing, or Film Formation of Organic Coatings
• D 1654, Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments
• D 1735, Standard Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus
5.1 color—The color of the inorganic zinc primer shall be as mutually agreed on and such that a definite contrast between it and the color of blasted steel is readily apparent.
5.2. Piginent—The extracted pigment on analysis shall conform to the minimum quantitative requirements specified in Table 1, and shall not vary more than a —2 percent or ±3 percent metallic zinc content from the initially approved primer.
5.2.1. The x-ray diffraction (XRD) pattern analysis of the zinc dust in the extracted pigment, which can differentiate metallic zinc content and zinc oxide content within total zinc content, shall be obtained tbr the initially approved primer. X-ray fluorescence (XRF) can be used to determine total zinc content. Determine Metallic Zinc content according to ASTM D52 I as mentioned in Table I.
5.3. Prime,- Quantitative Requirements—The mixed primer shall meet the quantitative requirements specified in Table I. Primer must meet applicable VOC content limitations for its intended use categories (shop or field application) as defined by Federal and local regulations. Primers for field coating shall comply with the requirements of 40 CFR, Part 59, Subpart D. Section 59.400 through 59.4 13. If thinning is necessary for application, the maximum amount of solvent added shall be such that the final product still complies with all the requirements of this section. including the VOC requirements.AASHTO M 300 pdf download.