ASTM G60-01

Standard Practice for Conducting Cyclic Humidity Exposures

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

• Replaces: ASTM G60-95 - Standard Practice for Conducting Cyclic Humidity Tests
• Effective Date: 10-Jun-2001
• Replaced By: ASTM G60-01(2007) - Standard Practice for Conducting Cyclic Humidity Exposures
• Effective Date: 01-Jun-2007
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:G60–01
Standard Practice for
1
Conducting Cyclic Humidity Exposures
ThisstandardisissuedunderthefixeddesignationG 60;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope a humidifying tower, a drying train, a dip mechanism, provi-
sions for introducing and draining the solution, a supply of
1.1 This practice covers procedures for conducting cyclic
2
compressed air, specimen supports, and necessary means of
humidity exposures with a corrosive dip. It sets forth the
control.
conditions required in cyclic humidity testing.
4.2 The size and detailed construction of the apparatus are
1.2 This practice does not prescribe the type of exposure
optional, provided the conditions obtained meet the require-
specimen or exposure periods nor the interpretation to be given
ments of this practice.
to the results.
4.3 AschematicdiagramoftheapparatusisshowninFig.1.
1.3 The values stated in SI units are to be regarded as the
4.4 The apparatus should be capable of providing an 8-h
standard. The values given in parentheses are for information
humidity cycle three times per day, as shown in Fig. 2, and a
only.
dip cycle once a day.
1.4 This standard does not purport to address all of the
4.4.1 The cyclic variation of humidity can be obtained by
safety concerns, if any, associated with its use. It is the
variation of the temperature of the water in the humidifying
responsibility of the user of this standard to consult and
tower. The temperature of the water is cycled thermostatically
establish appropriate safety and health practices and deter-
such that the relative humidity of air bubbling through the
mine the applicability of regulatory limitations prior to use.
3
water at a minimum rate of 1 L/min (.04 ft /min) will vary
2. Referenced Documents
between 100 and 50 % when the temperature of the air in the
test chamber is brought to 52 6 1°C (125 6 2°F).
2.1 ASTM Standards:
3
4.4.2 The range of relative humidity can be extended by
D 1193 Specification for Reagent Water
adding a drying period to the humidity cycle described above.
G1 Practice for Preparing, Cleaning, and Evaluating Cor-
4
The minimum relative humidity shall be #20 % and the
rosion Test Specimens
maximum relative humidity shall be$95 % for each cycle.
3. Significance and Use
4.4.3 Drops of solution which accumulate on the ceiling or
cover of the chamber shall not be permitted to fall on the
3.1 The procedure described is used to observe the behavior
specimens being exposed.
of steels under exposure conditions that retard the formation of
a protective type of rust. It is also used to evaluate seal coat on
NOTE 1—Instruments to continuously record temperature and humidity
insulation.
are not mandatory, but these provide the most reliable and economical
3.2 This practice should not be used to rank steels that form way of recording such information. In the absence of such instrumenta-
tion, temperature and humidity measurement shall be made, at least twice
a protective type of rust under atmospheric exposure condi-
a day, at the maximum and minimum humidity in a cycle.
tions.
4.5 Materials of Construction:
4. Apparatus
4.5.1 The test chamber should be made of inert materials
4.1 The apparatus required for cyclic humidity exposures
suchasplastics,glass,ormetalslinedwithimperviousplastics,
consists of a test chamber, provisions for heating the chamber,
rubber or epoxy-type materials, or materials exhibiting equiva-
lent corrosion resistance. Material of construction shall be such
that it will not affect the corrosiveness of the exposure
1
This practice is under the jurisdiction of ASTM Committee G01 on Corrosion
atmosphere.
of Metals and is the direct responsibility of Subcommittee G01.05 on Laboratory
4.5.2 Thedipsolutioncontainershouldnotbeaffectedbyor
Corrosion Tests.
Current edition approved June 10, 2001. Published July 2001. Originally
cause contamination of the dip solution.
published as G 60 – 79. Last previous edition G 60 – 95.
4.6 Specimen Supports:
2
Opinsky, A. J., Thomson, R. F., and Boegehold, A. L., “A Cyclic Humidity
Accelerated Corrosion Test for Sheet Steel”, ASTM Bulletin, January 1953.
3
Annual Book of ASTM Standards, Vol 11.01.
4
Annual Book of ASTM Standards, Vol 03.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
G60–01
FIG. 1 Main Parts of the Cyclic Humidity Corrosion Exposure Apparatus (Schematic)
FIG. 2 Humidity Cycle (Schematic)
4.6.1 The specimen-supporting device should not be af- last specimens should
...