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ASTM G33-99(R2020) pdf free download

ASTM G33-99(R2020) pdf free download.Standard Practice for Recording Data from Atmospheric Corrosion Tests of Metallic-Coated Steel Specimens
1. Scope
1.1 This practice covers a procedure for recording data of atmospheric corrosion tests of metallic-coated steel specimens. Its objective is the assurance of (1) complete identification of materials before testing, (2) objective reporting of material appearance during visual inspections, and (3) adequate photographic, micrographic, and chemical laboratory examina- tions at specific stages of deterioration, and at the end of the tests. 1.2 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.3 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Significance and Use
3.1 Use of this practice will maximize the benefits to be gained from atmospheric testing ofmetallic-coated steel. It will also aid in comparing results from one location to another where similar tests have been conducted.
4. Data to be Recorded Before Testing
4.1 Material Characteristics: 4.1.1 Coating and Basis Metal: Type of coating (zinc, aluminum, nickel-chromium, and so forth). Method of application (hot-dip, electroplated, electroless, mechanical plated, and so forth), (1) Area coated (if not 100 % of surface), (2) Pre-treatment (basis metal: flux, sand-blast, and so forth), and (3) Post-treatment (heating, sealing, and so forth), Coating composition, Basis metal product. (1) Basis metal composition, and (2) Metallurgical history prior to coating (if any). Chemical treatment of coating. Black and white photograph of typical surface area illustrating texture (1:1 magnification ratio). Micrograph of typical coating cross section (magni- fication and etchant to be specified). 4.1.2 Coating Weight and Thickness: Weight by stripping. (See Test Method A90/A90M or A428/A428M.) (1) Method. Measured Thickness. (1) Method (for example, eddy current, back scattering, magnetic), N OTE 1—If a magnetic type instrument is used, refer to Practice E376. (2) Number of determinations, (3) Mean, (4) Standard deviation, and (5) Range (spread of determinations). 4.2 Specimen Identification and Exposure Location: 4.2.1 Marking (method to be specified). 4.2.2 Specimen position in test area. 4.2.3 Angle of exposure from horizontal.4.2.4 Direction of specimen faces. 4.2.5 Location of test area. 4.2.6 Description of test area (location of nearby industry, ocean, and so forth, and recorded data on specific contaminants where possible). 4.2.7 Exposure starting date: Weather conditions (for example, bright, cloudy, sunshine, rain, and so forth), 4.3 Specimen Characteristics: 4.3.1 Description (sheet, wire, hardware, and so forth). 4.3.2 Specimen size: Specimen surface dimensions. Gage or thickness. 4.3.3 Specimen weight (when applicable). 4.3.4 Edge condition (to be specified). 4.3.5 Specimen preparation (method of cleaning). 4.3.6 Surface appearance (verbal description, color, texture, and so forth) (see 5.3).
5. Data to be Recorded During Field Inspections
5.1 Specimen Identification: 5.1.1 Marking. 5.1.2 Position in test area. 5.2 Exposure Period and Location: 5.2.1 Location. 5.2.2 Inspection date. Weather conditions (for example, bright, cloudy, sunshine, rain, and so forth). 5.3 Specimen Appearance (Top and Bottom Sides Should be Rated Separately): 5.3.1 Color: Hue—should be described by the following terms: red, orange, yellow, green, blue, violet, white, brown, gray, and black. Combination colors should be described by combining terms, for example, yellow-brown. Brilliance—should be described by light or dark. Saturation—should be described by pale or vivid. Area—of the specimen affected should be expressed in percent. 5.3.2 Surface Texture: The following terms should be used to describe the surface texture: (1) Lustrous—Having a high degree of specular reflectivity, (2) Semi-lustrous—Having a slight degree of reflectivity, (3) Matte—Without gloss or luster but having a smooth surface to touch, (4) Chalky—Having a matte surface with a powdery sur- face layer that can be wiped off with a finger touch, (5) Grainy—Having a uniformly roughened surface detect- able by touch, and (6) Pebbly—Having a rough and irregularly indented sur- face. The area of the specimen affected should be ex- pressed in percent. 5.3.3 Local Surface Irregularities: The following terms should be used to describe surface irregularities: (1) Blistering—Any separation of the coating from the substrate not accompanied by peeling, (2) Peeling—Separation of the coating from the substrate initiating at an edge of or cut in the coating and causing an exposure of the substrate, (3) Cracking—Any fissure in the coating other than a mechanical cut, (4) Checking—Cracking in a cross-hatch manner resem- bling mud cracking, (5) Rust—Corrosion products of iron characterized by rough, reddish brown particles. Rust is always rough to the touch

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