GB/T 2423.18-2021Environmental testing - Part 2: Test methods - Test Kb: Salt mist, cyclic (sodium chloride solution) (English PDF)

Foreword

This document is drafted in accordance with GB/T 1.1-2020 "Directives for

standardization - Part 1.Rules for the structure and drafting of standardizing

documents".

This document is Part 18 of GB/T 2423.For the issued parts of GB/T 2423, see

Annex NA.

This document replaces GB/T 2423.18-2012 "Environmental testing - Part 2.

Test methods - Test Kb. Salt mist, cyclic (sodium chloride solution)". Compared

with GB/T 2423.18-2012, in addition to structural adjustment and editorial

changes, the main technical changes are as follows.

a) Add a description of the effect of test conditions on the specimens (see

Clause 4);

b) Add the cycle process of test methods 7 and 8 (see Clause 9);

c) Modify Figure 1;

d) Add "Information to be given in the test report" (see Clause 13).

This document, using translation method, is identical to IEC 60068-2-52.2017

"Environmental testing - Part 2-52.Tests - Test Kb. Salt mist, cyclic (sodium

chloride solution)".

China's documents which have a consistent correspondence with the

international documents normatively referenced in this document are as follows.

- GB/T 2421-2020 Environmental testing - General and guidance (IEC

60068-1.2013, IDT);

- GB/T 2423.3-2016 Environmental testing - Part 2.Testing method - Test

Cab. Damp heat, steady state (IEC 60068-2-78.2012, IDT);

- GB/T 10125-2012 Corrosion tests in artificial atmospheres - Salt spray tests

(ISO 9227.2006, IDT).

This document has made the following editorial changes.

a) Change the name of this document to "Environmental testing - Part 2.Test

methods - Test Kb. Salt mist, cyclic (sodium chloride solution)";

b) Add an informative annex "Constituent documents of GB/T 2423" (see

Annex NA).

Attention is drawn to the possibility that some of the elements of this document

may be the subject of patent rights. The issuing authority of this document shall

not be held responsible for identifying any or all such patent rights.

This document was proposed by and shall be under the jurisdiction of National

Technical Committee 8 on Environmental Conditions of Electric and Electronic

Products and Environmental Test of Standardization Administration of China

(SAC/TC 8).

Drafting organizations of this document. China National Electric Apparatus

Research Institute Co., Ltd.; CVC Certification & Testing Co., Ltd.; Tsinghua

Shenzhen International Graduate School; Beijing Goldwind Science & Creation

Windpower Equipment Co., Ltd.; Shenzhen ORT Testing Technology Co., Ltd.;

Electric Power Research Institute of Hainan Power Grid Co., Ltd.; Guangzhou

Power Supply Bureau of Guangdong Power Grid Co., Ltd.; Wuxi Sunan

Experimental Equipment Co., Ltd.; Wuxi Soyater Test Equipment Co., Ltd.;

Shanghai Rece Electronic Technology Co., Ltd.; CenerTech Tianjin Chemical

Research and Design Institute Co., Ltd.; Hongli Zhihui Group Co., Ltd.; Nanjing

Wuhe Test Equipment Co., Ltd.; Shenzhen Polytechnic; Chongqing Yinhe

Experimental Equipment Co., Ltd.; Fujian Xinneng Offshore Wind Power R&D

Center Co., Ltd.; Beihang University; CCIC Southern Testing Co., Ltd.; Ningbo

Ouzhi Electrical Technology Co., Ltd.; Shinry Technologies Co., Ltd.; The Fifth

Electronics Research Institute of the Ministry of Industry and Information

Technology; Hainan Power Grid Co., Ltd.

Main drafters of this document. Jie Ganxin, Xu Xuedong, Wang Xilin, Hu

Xiaoming, Mei Liguang, Che Hansheng, Zhao Hailong, Wang Yong, Ni Yangyi,

Zhou Zhongming, Xu Dazhong, Guo Zhijia, Lv Tiangang, Zhang Dinghu, Yu

Zhan, Li Shushan, Wang Mingyang, Wang Xiaohui, Ma Ping, Ke Cilong, Gao

Jun, Zhang Hongbin, Fang Lianhang, Jia Zhidong, Liu Jing, An Penghui, Hu

Zhishan.

The previous releases of this document and the documents it replaces are as

follows.

- It was first issued in 1985 as GB/T 2423.18-1985, first revised in 2000, and

second revised in 2012;

- This is the third revision.

1 Scope

This document specifies the application of the cyclic salt mist test to

components or equipment designed to withstand a salt-laden atmosphere as

salt can degrade the performance of metallic and/or non-metallic materials.

This document is applicable to components or equipment that can withstand a

salt-laden atmosphere.

2 Normative references

The contents of the following documents, through normative references in this

text, constitute indispensable provisions of this document. Among them, for

dated references, only the edition corresponding to that date applies to this

document. For undated references, the latest edition (including all amendments)

applies to this document.

ISO 9227 Corrosion tests in artificial atmospheres - Salt spray tests

IEC 60068-1 Environmental testing - Part 1.General and guidance

3 Terms and definitions

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at

the following addresses.

4 General description of the test

Heated air in the chamber may cause evaporation of water from the test

specimen surface from decreasing relative humidity and increased specimen

temperature.

As the relative humidity increases, precipitated salt crystals on the specimen

surface absorb water vapour until a liquid electrolytic solution forms,

reinitializing the corrosion process.

The test specimen is allowed to equilibrate with standard laboratory conditions,

which results in gradual drying and relaxation from most corrosion reactions.

5 Test apparatus

The chamber shall conform to the requirements of ISO 9227.It shall maintain

a temperature of 35 °C +/- 2 K.

The chamber shall conform to the requirements of IEC 60068-1.It shall

maintain a relative humidity of 50 % +/- 5 % at a temperature of 23 °C +/- 2 K.

The chamber shall maintain a relative humidity of less than 30 % at a

temperature of 60 °C +/- 2 K.

6 Salt solution

The pH adjustment shall conform to the requirements of ISO 9227 for the

neutral salt solution test.

If necessary, filter the solution before placing it in the reservoir of the apparatus

to remove any solid matter which might block the apertures of the spraying

device.

7 Initial measurements

The test specimen(s) shall be visually inspected and, if necessary, electrically

and mechanically checked as required by the relevant specification.

8 Preconditioning

The relevant specification shall specify the cleaning procedure to be applied

immediately before the test; it shall also state whether temporary protective

coatings shall be removed.

9 Testing

All test methods may be performed in a single chamber provided it is capable

of maintaining the required conditions. If not, care should be taken to avoid loss

of salt solution deposits on the test specimen(s) and to avoid any damage to

the test specimen(s) due to manual handling.

One cycle is 8 h, as specified in test method 7 using acidified salt solution

instead of neutral salt solution. The recommended number of cycles is the same

as in test method 7.

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