ASTM G33-99(2020)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G33 − 99 (Reapproved 2020)
Standard Practice for
Recording Data from Atmospheric Corrosion Tests of
Metallic-Coated Steel Specimens
This standard is issued under the fixed designation G33; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Significance and Use
1.1 This practice covers a procedure for recording data of 3.1 Use of this practice will maximize the benefits to be
atmospheric corrosion tests of metallic-coated steel specimens. gainedfromatmospherictestingofmetallic-coatedsteel.Itwill
Its objective is the assurance of (1) complete identification of also aid in comparing results from one location to another
materials before testing, (2) objective reporting of material where similar tests have been conducted.
appearance during visual inspections, and (3) adequate
4. Data to be Recorded Before Testing
photographic, micrographic, and chemical laboratory examina-
4.1 Material Characteristics:
tions at specific stages of deterioration, and at the end of the
4.1.1 Coating and Basis Metal:
tests.
4.1.1.1 Type of coating (zinc, aluminum, nickel-chromium,
1.2 This standard does not purport to address all of the
and so forth).
safety concerns, if any, associated with its use. It is the
4.1.1.2 Method of application (hot-dip, electroplated,
responsibility of the user of this standard to establish appro-
electroless, mechanical plated, and so forth),
priate safety, health, and environmental practices and deter-
(1) Area coated (if not 100 % of surface),
mine the applicability of regulatory limitations prior to use.
(2) Pre-treatment (basis metal: flux, sand-blast, and so
1.3 This international standard was developed in accor-
forth), and
dance with internationally recognized principles on standard-
(3) Post-treatment (heating, sealing, and so forth),
ization established in the Decision on Principles for the
4.1.1.3 Coating composition,
Development of International Standards, Guides and Recom-
4.1.1.4 Basis metal product.
mendations issued by the World Trade Organization Technical
(1) Basis metal composition, and
Barriers to Trade (TBT) Committee.
(2) Metallurgical history prior to coating (if any).
4.1.1.5 Chemical treatment of coating.
2. Referenced Documents
4.1.1.6 Black and white photograph of typical surface area
2.1 ASTM Standards:
illustrating texture (1:1 magnification ratio).
A90/A90M Test Method for Weight [Mass] of Coating on
4.1.1.7 Micrograph of typical coating cross section (magni-
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
fication and etchant to be specified).
A428/A428M Test Method for Weight [Mass] of Coating on
4.1.2 Coating Weight and Thickness:
Aluminum-Coated Iron or Steel Articles
4.1.2.1 Weight by stripping. (See Test Method A90/A90M
E376 Practice for Measuring Coating Thickness by
or A428/A428M.)
Magnetic-Field or Eddy Current (Electromagnetic) Test-
(1) Method.
ing Methods
4.1.2.2 Measured Thickness.
G46 Guide for Examination and Evaluation of Pitting Cor-
(1) Method (for example, eddy current, back scattering,
rosion
magnetic),
NOTE 1—If a magnetic type instrument is used, refer to Practice E376.
(2) Number of determinations,
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion
(3) Mean,
of Metals and is the direct responsibility of Subcommittee G01.04 on Corrosion of
Metals in Natural Atmospheric and Aqueous Environments.
(4) Standard deviation, and
Current edition approved Nov. 1, 2020. Published November 2020. Originally
(5) Range (spread of determinations).
approved in 1972. Last previous edition approved in 2015 as G33–99(2015). DOI:
10.1520/G0033-99R20.
4.2 Specimen Identification and Exposure Location:
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.2.1 Marking (method to be specified).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.2.2 Specimen position in test area.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.2.3 Angle of exposure from horizontal.
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G33 − 99 (2020)
4.2.4 Direction of specimen faces. 5.3.3.1 The following terms should be used to describe
4.2.5 Location of test area. surface irregularities:
(1) Blistering—Any separation of the coating from the
4.2.6 Description of test area (location of nearby industry,
substrate not accompanied by peeling,
ocean,andsoforth,andrecordeddataonspecificcontaminants
(2) Peeling—Separation of the coating from the substrate
where possible).
initiating at an edge of or cut in the coating and causing an
4.2.7 Exposure starting date:
exposure of the substrate,
4.2.7.1 Weather conditions (for example, bright, cloudy,
(3) Cracking—Any fissure in the coating other than a
sunshine, rain, and so forth),
mechanical cut,
4.3 Specimen Characteristics:
(4) Checking—Cracking in a cross-hatch manner resem-
4.3.1 Description (sheet, wire, hardware, and so forth).
bling mud cracking,
4.3.2 Specimen size:
(5) Rust—Corrosion products of iron characterized by
4.3.2.1 Specimen surface dimensions.
rough, reddish brown particles. Rust is always rough to the
4.3.2.2 Gage or thickness.
touch,
4.3.3 Specimen weight (when applicable).
(6) Tubercles—Knob-like protrusions of corrosion
4.3.4 Edge condition (to be specified).
products,
4.3.5 Specimen
...