ASTM G33-99

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Designation: G 33 – 99
Standard Practice for
Recording Data from Atmospheric Corrosion Tests of
Metallic-Coated Steel Specimens
This standard is issued under the fixed designation G 33; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Data to be Recorded Before Testing
1.1 This practice outlines 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 etc).
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, etc),
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, etc), and
1.2 This standard does not purport to address all of the (3) Post-treatment (heating, sealing, etc),
safety concerns, if any, associated with its use. It is the 4.1.1.3 Coating composition,
responsibility of the user of this standard to establish appro- 4.1.1.4 Basis metal product.
priate safety and health practices and determine the applica- (1) Basis metal composition, and
bility of regulatory limitations prior to use. (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).
A 90/A 90M 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).
A 428/A 428M Test method for Weight (Mass) of Coating
4.1.2 Coating Weight and Thickness:
on Aluminum-Coated Iron or Steeel Articles 4.1.2.1 Weight by stripping. (See Test Method A 90/A90M
E 376 Practice for Measuring Coating Thickness by
or A 428/A 428M.)
Magnetic-Field or Eddy-Current (Electromagnetic) Test (1) Method.
Methods
4.1.2.2 Measured Thickness.
G 46 Guide for Examination and Evaluation of Pitting (1) Method (for example, eddy current, back scattering,
Corrosion
magnetic),
NOTE 1—If a magnetic type instrument is used, refer to Practice E 376.
3. Significance and Use
(2) Number of determinations,
3.1 Use of this practice will maximize the benefits to be
(3) Mean,
gained from atmospheric testing of metallic-coated steel. It will
(4) Standard deviation, and
also aid in comparing results from one location to another
(5) Range (spread of determinations).
where similar tests have been conducted.
4.2 Specimen Identification and Exposure Location:
4.2.1 Marking (method to be specified).
4.2.2 Specimen position in test area.
This practice is under the jurisdiction of ASTM Committee G-1 on Corrosion
4.2.3 Angle of exposure from horizontal.
of Metals and is the direct responsibility of Subcommittee G01.04 on Atmospheric
4.2.4 Direction of specimen faces.
Corrosion.
Current edition approved Oct. 10, 1999. Published December 1999. Originally
4.2.5 Location of test area.
published as G 33 – 72. Last previous edition G 33 – 88(1993).
4.2.6 Description of test area (location of nearby industry,
Annual Book of ASTM Standards, Vol 01.06.
3 ocean, etc, and recorded data on specific contaminants where
Annual Book of ASTM Standards, Vol 03.03.
Annual Book of ASTM Standards, Vol 03.02. possible).
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G33
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, etc),
(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, etc).
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.
etc) (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.
6.1.1 Marking.
5.1.2 Position in test area.
6.1.2 Position in test area.
5.2 Exposure Period and Location:
6.2
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