GB/T 10125-2021 English PDF (GBT10125-2021)

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GB/T 10125-2021: Corrosion tests in artificial atmospheres -- Salt spray tests
GB/T 10125-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.060
CCS H 25
Replacing GB/T 10125-2012
Corrosion tests in artificial atmospheres - Salt spray
tests
(ISO 9227:2017, MOD)
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4 
Introduction ... 7 
1 Scope ... 8 
2 Normative references ... 9 
3 Terms and definitions ... 10 
4 Principle ... 11 
5 Test solution ... 11 
6 Test equipment ... 12 
7 Methods of evaluating the performance of salt spray chamber ... 15 
8 Test specimen ... 17 
9 Placement of test specimens ... 18 
10 Test conditions ... 18 
11 Test period ... 19 
12 Handling of test specimens after the test ... 20 
13 Evaluation of test results ... 21 
14 Test report ... 21 
Appendix A (Informative) Comparison of clause numbers between this
document and ISO 9227:2017 ... 23 
Appendix B (Informative) List of technical differences between this document
and ISO 9227:2017 and their reasons ... 24 
Appendix C (Informative) A schematic diagram of the design of a salt spray
chamber with the function of treating salt spray waste gas and wastewater .. 26 
Appendix D (Informative) Supplementary method for evaluating the
performance of salt spray chamber by using zinc reference specimen ... 28 
Appendix E (Normative) Preparation of organic coating specimen ... 30 
Appendix F (Normative) Additional information for organic coating test
specimens ... 32 
Appendix G (Informative) Supplementary information about steel reference
specimen's designation ... 33 
References ... 34 
   
Corrosion tests in artificial atmospheres - Salt spray
tests
1 Scope
This document specifies the equipment, reagents, methods for neutral salt
spray (NSS), acetic acid salt spray (AASS), copper accelerated acetic acid salt
spray (CASS) tests. This document also specifies methods for evaluating the
corrosiveness of the test chamber atmosphere.
This document is suitable for evaluating the corrosion resistance of metal
materials and coatings. The tested object can have permanent or temporary
corrosion resistance, OR it may not have permanent or temporary corrosion
resistance.
This document does not specify the size and type of test specimens, the test
cycle of special products and the interpretation of results; for these contents,
refer to the corresponding product specifications.
This document is suitable for detecting discontinuities of metals and their alloys,
metal coatings, organic coatings, anodic oxide films, conversion coatings, such
as pores and other defects.
The neutral salt spray test is suitable for:
- Metals and their alloys;
- Metal coating (anodic or cathodic);
- Conversion film;
- Anodized film;
- Organic coating on metal substrate.
The acetic acid salt spray test is suitable for decorative coatings of copper +
nickel + chromium or nickel + chromium. It is also suitable for aluminum anodic
oxide films and organic coatings.
The copper accelerated acetic acid salt spray test is suitable for decorative
coatings of copper + nickel + chromium or nickel + chromium. It is also suitable
for aluminum anodic oxide films and organic coatings.
These methods are suitable for quality inspection when metal materials have
OR do not have corrosion protection. They are not suitable for sorting different
materials with corrosion resistance OR predicting the long-term corrosion
resistance of test materials.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB/T 6461 Methods for corrosion testing of metallic and other inorganic
coatings on metallic substrates - Rating of test specimens and manufactured
articles subjected to corrosion tests (GB/T 6461-2002, ISO 10289:1999, IDT)
GB/T 9271 Paints and varnishes standard panels for testing (GB/T 9271-
2008, ISO 1514:2004, MOD)
GB/T 10123 Corrosion of metals and alloys - Basic terms and definitions
(GB/T 10123-2001, eqv ISO 8044-1999)
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T
13452.2-2008, ISO 2808:2007, IDT)
GB/T 16545 Corrosion of metals and alloys - Removal of corrosion products
from corrosion test specimens (GB/T 16545-2015, ISO 8407:2009, IDT)
GB/T 30786 Paints and varnishes - Guidelines for the introduction of scribe
marks through coatings on metallic panels for corrosion testing (GB/T
30786-2014, ISO 17872-2007, IDT)
GB/T 30789.1 Paints and varnishes - Evaluation of degradation of coatings
- Designation of quantity and size of defects ,and of intensity of uniform
changes in appearance - Part 1: General introduction and designation
system (GB/T 30789.1-2015, ISO 4628-1:2003, IDT)
GB/T 30789.2 Paints and varnishes - Evaluation of degradation of coatings
- Designation of quantity and size of defects, and of intensity of uniform
changes in appearance - Part 2: Assessment of degree of blistering (GB/T
30789.2-2014, ISO 4628-2:2003, IDT)
GB/T 30789.3 Paints and varnishes - Evaluation of degradation of coatings
- Designation of quantity and size of defects, and of intensity of uniform
changes in appearance - Part 3: Assessment of degree of rusting (GB/T
30789.3-2014, ISO 4628-3:2003, IDT)
to the pH value of the collected spray solution.
5.2.2 Neutral salt spray test (NSS test)
The pH value of the test solution (5.1) shall be adjusted, so that the pH value
of the spray solution, which is collected in the salt spray chamber (6.2), is
between 6.5 and 7.2, at 25 °C ± 2 °C. Use a potentiometric pH meter to measure
the pH value. The pH value shall be measured, by an electrode suitable for
weakly buffered sodium chloride solution (dissolved in deionized water). The
pH value of the solution is adjusted, by a solution which is prepared by analytical
pure hydrochloric acid, sodium hydroxide or sodium bicarbonate.
Note: The loss of carbon dioxide in the solution, during spraying, may cause pH
changes. Take corresponding measures, such as heating the solution to more than
35 °C, before sending it into the instrument or preparing the solution with new boiling
water, to reduce the carbon dioxide content in the solution.
5.2.3 Acetic acid salt spray test (AASS test)
Add appropriate amount of glacial acetic acid (CH3COOH) to the sodium
chloride solution, which is prepared in accordance with 5.1, to ensure that the
pH value of the collected liquid, in the salt spray chamber (6.2), is between 3.1
and 3.3, at 25 °C ± 2 °C. If the pH value of the initially prepared solution is 3.0
~ 3.1, the pH value of the collected solution is generally within the specified
range. Use a potentiometric pH meter to measure the pH value. The pH value
shall be measured, by an electrode which is suitable for weakly buffered sodium
chloride solution (dissolved in deionized water). The pH value of the solution is
adjusted with a solution, which is prepared by analytical pure glacial acetic acid
(CH3COOH), sodium hydroxide (NaOH) or sodium bicarbonate (NaHCO3).
5.2.4 Copper accelerated acetic acid salt spray test (CASS test)
In the salt solution, which is prepared according to 5.1,...