ASTM G60-95

Standard Practice for Conducting Cyclic Humidity Tests

SCOPE
1.1 This test method covers procedures for conducting cyclic humidity tests with a corrosive dip.  It sets forth the conditions required in cyclic humidity testing.  
1.2 This practice does not prescribe the type of test specimen or exposure periods nor the interpretation to be given to the results.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Jun-2001
• ICS: 19.040 - Environmental testing
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.05 - Laboratory Corrosion Tests

Relations

• Replaced By: ASTM G60-01 - Standard Practice for Conducting Cyclic Humidity Exposures
• Effective Date: 10-Jun-2001
• Referred By: ASTM D3794-22 - Standard Guide for Testing Coil Coatings
• Effective Date: 10-Jun-2001
• Referred By: ASTM G198-17 - Standard Test Method for Determining the Relative Corrosion Performance of Driven Fasteners in Contact with Treated Wood
• Effective Date: 10-Jun-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: G 60 – 95 An American National Standard
Standard Test Method for
Conducting Cyclic Humidity Tests
This standard is issued under the fixed designation G 60; 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 4.2 A schematic diagram of the apparatus is shown in Fig. 1.
4.3 The apparatus should be capable of providing an 8-h
1.1 This test method covers procedures for conducting
humidity cycle three times per day, as shown in Fig. 2, and a
cyclic humidity tests with a corrosive dip. It sets forth the
dip cycle once a day.
conditions required in cyclic humidity testing.
4.3.1 The cyclic variation of humidity can be obtained by
1.2 This test method does not prescribe the type of test
variation of the temperature of the water in the humidifying
specimen or exposure periods nor the interpretation to be given
tower. The temperature of the water is cycled thermostatically
to the results.
such that the relative humidity of air bubbling through the
1.3 The values stated in SI units are to be regarded as the
water at a minimum rate of 1 L/min (.04 ft /min) will vary
standard. The values given in parentheses are for information
between 100 and 50 % when the temperature of the air in the
only.
test chamber is brought to 52 6 1°C (125 6 2°F).
1.4 This standard does not purport to address all of the
4.3.2 The range of relative humidity can be extended by
safety concerns, if any, associated with its use. It is the
adding a drying period to the humidity cycle described above.
responsibility of the user of this standard to consult and
The control circuit (see Annex A1 and Fig. 3) is arranged such
establish appropriate safety and health practices and deter-
that the air is switched to the drying train when the relative
mine the applicability of regulatory limitations prior to use.
humidity has descended to 50 %. The drying train can be a
2. Referenced Documents
desiccating tower containing anhydrous calcium sulfate. The
minimum relative humidity shall be 20 % or less and the
2.1 ASTM Standards:
maximum relative humidity shall be 95 % or more for each
D 1193 Specification for Reagent Water
cycle.
G 1 Practice for Preparing, Cleaning, and Evaluating Cor-
rosion Test Specimens
NOTE 1—Instruments to continuously record temperature and humidity
are not mandatory, but these provide the most reliable and economical
3. Significance and Use
way of recording such information. In the absence of such instrumenta-
tion, temperature and humidity measurement shall be made, at least twice
3.1 The procedure described is used to observe the behavior
a day, at the maximum and minimum humidity in a cycle.
of steels under test conditions that retard the formation of a
protective type of rust. 4.4 Materials of Construction:
3.2 This test method should not be used to rank steels that
4.4.1 The test chamber should be made of inert materials
form a protective type of rust under atmospheric exposure such as plastics, glass or metals lined with impervious plastics,
conditions.
rubber or epoxy-type materials, or materials exhibiting equiva-
lent corrosion resistance.
4. Apparatus
4.4.2 The dip solution container should not be affected by or
4.1 The apparatus required for cyclic humidity testing
cause contamination of the dip solution.
consists of a test chamber, provisions for heating the chamber,
4.4.3 Specimen Supports:
a humidifying tower, a drying train, a dip mechanism, provi-
4.4.3.1 The specimen-supporting device should not be af-
sions for introducing and draining the solution, a supply of
fected by or cause contamination of the dip solution.
compressed air, specimen supports, and necessary means of
4.4.3.2 The method of supporting specimens will vary with
control (see Annex A1).
the apparatus used for conducting the tests, but should be
designed to insulate the specimens from each other physically
and electrically and to insulate the specimens from any metallic
This test method is under the jurisdiction of ASTM Committee G-1 on
Corrosion of Metals, and is the direct responsibility of Subcommittee G01.05 on container or supporting device used within the apparatus.
Laboratory Corrosion Tests.
4.4.3.3 Shape and form of the specimen support should
Current edition approved Feb. 15, 1995. Published April 1995. Originally
assure free contact of the specimen with the corrosive solution,
published as G 60 – 79. Last previous edition G 60 – 86.
the liquid line, or the vapor phase. In a stacked rack, the first
Opinsky, A. J., Thomson, R. F., and Boegehold, A. L., “A Cyclic Humidity
Accelerated Corrosion Test for Sheet Steel”, ASTM Bulletin, January 1953.
and last specimens should be dummy specimens so that the
Annual Book of ASTM Standards, Vol 11.01.
outermost test specimens are shielded by their neighbors in the
Annual Book of ASTM Standards, Vol 03.02.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
G60
TABLE 1 Summary of Mass Loss from Replicate Tests of Low Carbon Steels in the Cyclic Humidity Test
Mass Loss (g/m )
Steel Test 8 Test 9 Test 18
No. Mean Stnd. Dev. No. Mean Stnd. Dev. No. Mean Stnd. Dev.
A 10 9.22 0.16 . . .
B 9 10.77 0.18 . . .
C 10 9.60 0.13 . . .
D . . . . . . 6 8.90 0.17
E . . . 6 10.02 0.52 6 9.80 0.31
F . . . 6 9.21 0.21 6 9.35 0.48
G . . . 6 11.30 0.48 6 11.00 0.21
No. 5 Number of test specimens.
Stnd. Dev. 5 Standard deviation.
FIG. 1 Main Parts of the Corrosion Testing Apparatus (Schematic)
FIG. 2 Humidity Cycle (Schematic)
same manner as specimens in the middle of the stack. all reagents shall conform to the specifications of the Commit-
tee on Analytical Reagents of t
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