ASTM G33 - 99 (2025) 金属镀层钢样品对大气腐蚀检测数据的记录的标准操作规程

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Designation: G33 −99 (Reapproved 2025)
Standard Practice for
Recording Data from Atmospheric Corrosion Tests of
Metallic-Coated Steel Specimens
1
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. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
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 of regulatory 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.
2. Referenced Documents
2.1 ASTM Standards:
2
A90/A90M Test Method for Weight [Mass] of Coating on
Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
A428/A428M Test Method for Weight [Mass] of Coating on
Aluminum-Coated Iron or Steel Articles
E376 Practice for Measuring Coating Thickness by
Magnetic-Field or Eddy Current (Electromagnetic) Test-
ing Methods
G46 Guide for Examination and Evaluation of Pitting Cor-
rosion
3. Signiﬁcance and Use
3.1 Use of this practice will maximize the beneﬁts to be
gained from atmospheric testing of metallic-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:
4.1.1.1 Type of coating (zinc, aluminum, nickel-chromium,
and so forth).
4.1.1.2 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).
4.1.1.3 Coating composition.
4.1.1.4 Basis metal product.
(1) Basis metal composition, and
(2) Metallurgical history prior to coating (if any).
4.1.1.5 Chemical treatment of coating.
4.1.1.6 Black and white photograph of typical surface area
illustrating texture (1:1 magniﬁcation ratio).
4.1.1.7 Micrograph of typical coating cross section (magni-
ﬁcation and etchant to be speciﬁed).
4.1.2 Coating Weight and Thickness:
4.1.2.1 Weight by stripping. (See Test Method A90/A90M
or A428/A428M.)
(1) Method.
4.1.2.2 Measured thickness.
(1) Method (for example, eddy current, back scattering,
magnetic),
NOTE 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.
1
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion
of Metals and is the direct responsibility of Subcommittee G01.04 on Corrosion of
Metals in Natural Atmospheric and Aqueous Environments.
Current edition approved Oct. 1, 2025. Published October 2025. Originally
approved in 1972. Last previous edition approved in 2020 as G33 – 99 (2020). DOI:
10.1520/G0033-99R25.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at www.astm.org/contact. For Annual Book of
ASTM Standards volume information, refer to the standard’s Document Summary
page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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.
1

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.

4.2.7.1 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.

4.3.2.1 Specimen surface dimensions.

4.3.2.2 Gauge 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.

5.2.2.1 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:

5.3.1.1 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.

5.3.1.2 Brilliance should be described by light or dark.

5.3.1.3 Saturation should be described by pale or vivid.

5.3.1.4 Area of the specimen affected should be expressed in

percent.

5.3.2 Surface Texture:

5.3.2.1 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.

5.3.2.2 The area of the specimen affected should be ex-

pressed in percent.

5.3.3 Local Surface Irregularities:

5.3.3.1 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,

(6) Tubercles—Knob-like protrusions of corrosion

products,

(7) Nodules—Little lumps, and

(8) Pits—Cavities or holes in the metal surface.

5.3.3.2 Blisters, cracks, nodules, tubercles, and pits should

be reported by number and size. Peeling, checking, and rust

should be reported by percent area affected.

6. Data to Be Recorded When Samples Are Removed at

the Conclusion of the Test

6.1 Specimen Identiﬁcation:

6.1.1 Marking.

6.1.2 Position in test area.

6.2 Exposure Period and Location:

6.2.1 Location.

6.2.2 Weather conditions (for example, bright, cloudy,

sunshine, rain, and so forth).

6.2.3 Removal date.

6.2.4 Exposure time in years (fractions as decimals to

nearest tenth).

6.3 Specimen Appearance (Top and Bottom Sides Should be

Rated Separately) (See 5.3):

6.3.1 Color.

6.3.2 Surface texture.

6.3.3 Local surface irregularities.

6.4 Specimen Characteristics:

6.4.1 Black and white photographs to illustrate typical

features (magniﬁcation ratio 1:1).

6.4.2 Microsections of coating on panel to be speciﬁed at

beginning of tests to record any inter-granular corrosion,

penetration to base metal, penetration along base metal-coating

interface, nature of attack at the heaviest corrosion site on the

specimen, and other signiﬁcant details (magniﬁcation and

etchant to be speciﬁed).

6.5 Coating Mass Loss and Thickness Determination:

6.5.1 Coating mass determined by stripping (mass loss).

6.5.1.1 Removal of corrosion product-method.

6.5.1.2 Weight before stripping.

6.5.1.3 Stripping of coating-method.

6.5.1.4 Weight after stripping.

6.5.1.5 Mass loss of control (unexposed panel(s)) using

above procedure (6.5.1).

G33 − 99 (2025)

6.5.1.6 Net mass loss due to exposure after applying control

panel correction (mass loss exposed panel(s) minus mass loss

control panel(s)).

6.5.2 Measured coating thickness after cleaning.

6.5.2.1 Method.

6.5.2.2 Number of determinations.

6.5.2.3 Mean.

6.5.2.4 Standard deviation.

6.5.2.5 Observed range.

6.5.2.6 Average thickness loss due to exposure.

6.5.3 In the event residual coating mass determinations are

desired on partially rusted specimens, the determination should

be made by analyzing the stripping solution for the coating

metal.

7. Exceptions to Practice

7.1 In speciﬁc instances there will undoubtedly be cases

where the procedure should be expanded in certain areas. For

example:

7.1.1 Depth of deepest pit, if pitting is present.

7.1.2 Average depth of ten deepest pits, if pitting is present.

(See Guide G46.)

7.1.3 Coating mass on each surface.

7.1.4 Coating mass loss on each surface.

7.2 In certain instances, lack of information or other factors

may make it impossible or impractical to obtain data for each

point in the practice. Any deletions or omissions from the

practice should be noted by the experimenters with a brief

explanation of why the omission was made.

8. Keywords

8.1 atmospheric corrosion; mass loss; metallic coatings;

pitting

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned

in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk

of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ﬁve years and

if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards

and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the

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make your views known to the ASTM Committee on Standards, at the address shown below.

This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,

United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above

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G33 − 99 (2025)

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摘要：

本文件为ASTM G33 - 99 (2025)《金属镀层钢样品对大气腐蚀检测数据的记录的标准操作规程》提供全面解析。该标准旨在规范金属镀层钢样品在大气环境暴露试验中腐蚀检测数据的记录方法与流程，确保数据采集、整理、存档及报告的一致性与可比性。标准适用于各类金属镀层钢试件，包括但不限于镀锌、镀镉、镀铜、镀镍及多层镀层体系，并覆盖不同大气环境（工业、海洋、乡村等）下的长期户外曝晒测试。通过统一记录格式、明确数据项（如腐蚀失重、腐蚀形貌、点蚀深度、镀层附着力变化等）及观测周期，该规程帮助研究机构、材

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