ASTM G33-99(2004)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:G33–99 (Reapproved 2004)
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 4. Data to be Recorded Before Testing
1.1 This practice covers a procedure for recording data of 4.1 Material Characteristics:
atmospheric corrosion tests of metallic-coated steel specimens. 4.1.1 Coating and Basis Metal:
Its objective is the assurance of (1) complete identification of 4.1.1.1 Type of coating (zinc, aluminum, nickel-chromium,
materials before testing, (2) objective reporting of material and so forth).
appearance during visual inspections, and ( 3) adequate pho- 4.1.1.2 Method of application (hot-dip, electroplated, elec-
tographic, micrographic, and chemical laboratory examina- troless, mechanical plated, and so forth),
tions at specific stages of deterioration, and at the end of the (1) Area coated (if not 100 % of surface),
tests. (2) Pre-treatment (basis metal: flux, sand-blast, and so
1.2 This standard does not purport to address all of the forth), and
safety concerns, if any, associated with its use. It is the (3) Post-treatment (heating, sealing, and so forth),
responsibility of the user of this standard to establish appro- 4.1.1.3 Coating composition,
priate safety and health practices and determine the applica- 4.1.1.4 Basis metal product.
bility of regulatory limitations prior to use. (1) Basis metal composition, and
(2) Metallurgical history prior to coating (if any).
2. Referenced Documents
4.1.1.5 Chemical treatment of coating.
2.1 ASTM Standards:
4.1.1.6 Black and white photograph of typical surface area
A90/A90M Test Method for Weight [Mass] of Coating on illustrating texture (1:1 magnification ratio).
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
4.1.1.7 Micrograph of typical coating cross section (magni-
A428/A428M TestMethodforWeight[Mass]ofCoatingon
fication and etchant to be specified).
Aluminum-Coated Iron or Steel Articles 4.1.2 Coating Weight and Thickness:
E376 Practice for Measuring Coating Thickness by
4.1.2.1 Weight by stripping. (See Test Method A90/A90M
Magnetic-FieldorEddy-Current(Electromagnetic)Exami- or A428/A428M.)
nation Methods
(1) Method.
G46 Guide for Examination and Evaluation of Pitting 4.1.2.2 Measured Thickness.
Corrosion
(1) Method (for example, eddy current, back scattering,
magnetic),
3. Significance and Use
NOTE 1—If a magnetic type instrument is used, refer to Practice E376.
3.1 Use of this practice will maximize the benefits to be
(2) Number of determinations,
gainedfromatmospherictestingofmetallic-coatedsteel.Itwill
(3) Mean,
also aid in comparing results from one location to another
(4) Standard deviation, and
where similar tests have been conducted.
(5) Range (spread of determinations).
4.2 Specimen Identification and Exposure Location:
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion 4.2.1 Marking (method to be specified).
of Metals and is the direct responsibility of Subcommittee G01.04 on Atmospheric
4.2.2 Specimen position in test area.
Corrosion.
4.2.3 Angle of exposure from horizontal.
Current edition approved Nov 1, 2004. Published November 2004. Originally
4.2.4 Direction of specimen faces.
approved in 1972. Last previous edition approved in 1999 as G33 – 99. DOI:
10.1520/G0033-99R04.
4.2.5 Location of test area.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.2.6 Description of test area (location of nearby industry,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ocean,andsoforth,andrecordeddataonspecificcontaminants
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. where possible).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
G33–99 (2004)
4.2.7 Exposure starting date: (4) Checking—Cracking in a cross-hatch manner resem-
4.2.7.1 Weather conditions (for example, bright, cloudy, bling mud cracking,
sunshine, rain, and so forth),
(5) Rust—Corrosion products of iron characterized by
4.3 Specimen Characteristics: rough, reddish brown particles. Rust is always rough to the
4.3.1 Description (sheet, wire, hardware, and so forth).
touch,
4.3.2 Specimen size:
(6) Tubercles—Knob-like protrusions of corrosion prod-
4.3.2.1 Specimen surface dimensions.
ucts,
4.3.2.2 Gage or thickness.
(7) Nodules—Little lumps, and
4.3.3 Specimen weight (when applicable).
(8) Pits—Cavities or holes in the metal surface.
4.3.4 Edge condition (to be specified).
5.3.3.2 Blisters, cracks, nodules, tubercles, and pits should
4.3.5 Specimen preparation (method of cleaning).
be reported by number and size. Peeling, checking, and rust
4.3.6 Surface appearance (verbal description, color, texture,
should be reported by percent area affected.
and so forth) (see 5.3).
6. Data to Be Recorded When Samples Are Removed at
5. Data to be Recorded During Field Inspections
the Conclusion of the Test
5.1 Specimen Identification:
6.1 Specimen Identification:
5.1.1 Marking.
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