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ORT's Salt Mist Test Standard Was Released By The State Administration For Market Regulation

The Salt Mist Test Standard drafted by ORT was authoritatively released by the State Administration for Market Regulation

Ⅰ. Basic situation of salt mist test standard

The name of the standard:

Environmental testing-Part 2: Test methods-Test Kb: Salt mist, cyclic (sodium chloride solution)

Standard No.: GB/T 2423.18-2021/IEC 60068-2-52: 2017.

The standard replaces the standard GB/T 2423.18-2012 《Environmental testing—Part 2: Test methods—Test Kb: Salt mist, cyclic(sodium chloride solution)》

This standard was released on May 21, 2021, and will be implemented on December 1, 2021.

This standard is reported under TC8 (National Standardization Technical Committee for Environmental Conditions and Environmental Tests of Electrical and Electronic Products), and TC8/SC2 (Climate Environmental Testing Branch of National Standardization Technical Committee for Environmental Conditions and Environmental Tests of Electrical and Electronic Products) is implemented. The competent authority is the national standardization management.

The range of standards:

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 parts manufactured using metallic and/or non-metallic materials.

Test Method:

This document is applicable to components or equipment that can withstand a salty atmosphere, and the corresponding severity level is selected according to the degree of tolerance during the test. This document gives eight following test methods.

Test Method 1

One cycle is seven days. One cycle shall consist of spraying the specimen with a salt solution at 35 °C ± 2 K for 2 h, followed by the humid condition at 40 °C ± 2 K, 93 % ± 3 % RH for six days and 22 h. The required number of cycles is four (28 days).

In the case of manual handling, the transition time (maximum 2 h) should be included in the humid condition period of 22 h.

Test Method 2

One cycle is one day. One cycle shall consist of spraying the specimen with a salt solution at 35 °C ± 2 K for 2 h, followed by the humid condition at 40 °C ± 2 K, 93 % ± 3 % RH for 22 h.The required number of cycles is three (three days).

In the case of manual handling, the transition time (maximum 2 h) should be included in the humid condition period of 22 h.

Test Method 3

One cycle is seven days. One cycle shall consist of spraying the specimen with a salt solution at 35 °C ± 2 K for 2 h, followed by the humid condition at 40 °C ± 2 K, 93 % ± 3 % RH for 22h. This shall be repeated four times. The test specimens shall then be stored under a standard atmosphere at 23 °C ± 2 K and 50 % ± 5 % RH for three days. The required number of cycles is one (seven days).

In the case of manual handling, the transition time (maximum 2 h) should be included in the humid condition period of 22 h and the standard atmosphere period of three days.

Test Method 4

The required number of cycles as specified in test method 3 shall be two (14 days)

Test Method 5

The required number of cycles as specified in test method 3 shall be four (28 days).

Test Method 6

The required number of cycles as specified in test method 3 shall be eight (56 days).

Test Method 7

One cycle is 8 h. One cycle shall consist of spraying the specimen with a salt solution at 35 °C ± 2 K for 2 h, followed by the dry condition at 60 °C ± 2 K, under 30 % RH for 4 h and then the humid condition at 50 °C ± 2 K, over 95 % RH for 2 h.

The transition times (time allowed to reach the temperature and relative humidity specified for a condition after changing to that condition) for temp. and humidity shall be specified between the following choices and reported:

--Salt mist to dry condition: within 30min or 30min~60min;

--Dry condition to humid condition: within 15min or 15min~30min;

--Humid condition to salt mist: within 30min.

Those transition times should be included in the next test condition period of the pair, for example, the salt mist to dry condition transition time is included in the period of the dry condition. Spraying the specimen with a salt solution begins instantaneously once the salt mist is started.

The recommended number of cycles are 3 (1 day), 6 (2 days), 12 (4 days), 30 (10 days), 45 (15 days), 60 (20 days), 90 (30 days), 150 (50 days) and 180 (60 days).

Test Method 8

One cycle is 8h. as specified in test method 7 using acidified salt solution instead of a neutral salt solution.

The recommended number of cycles is the same as in test method 7.


Ⅱ. The production of salt fog environment

Salt fog refers to a diffusion system composed of small droplets of salt fog in the atmosphere. The seaside or saline-alkali areas have higher salt fog content. The seaside is mainly due to the foaming of the waves, which is then brought into the air by the wind to form atmospheric salt nuclei, thereby producing salt fog. The higher the wind speed, the higher the salt fog content. These salt fog can reach an altitude of more than 2,000 meters with the updraft, and can also drift to land several kilometers away with the wind. The ocean transports about 2.72*10^10T of salt cores to the land each year, while the saline soil is the salty soil that is blown and crushed by the wind and then brought into the air. The wind rises to the sky to form dry salt dust or salt fog. According to actual measurement, the amount of salt nuclei measured in the hinterland of Hebei is more than that in Shandong and other coastal areas, But due to the dry weather, salt fog may not form.

Distance from the coast

Medium and low   (0.01~0.1)

Medium (0.1~1)

High (>1.0)

The salt content in the air (mg/m3)

Polar region

1.92

/

/

Temperate region

19.2

1.92

/

Tropical region

198.4

49.6

0.96


Ⅲ. The failure mechanism of salt mist test

The corrosion of salt mist on the surface of metal materials is caused by the chemical reaction between the oxide layer and the protective layer containing chloride ions penetrating the metal and the internal metal.

There are three types of failures caused by salt mist: Corrosion, Electrical effects, and Physical effects. The main reason for corrosion is the ionization of salt in the water to form acid and alkali, which is prone to electrochemistry reactions; the main electrical effect is that the deposition of salt causes damage to electronic equipment, and the corrosion of conductive layers and insulating materials and metals; The physical effect is caused by the interference of the moving parts of the mechanical parts or the jamming and electrolysis, which causes the surface to blistering and falling off.

The coating structure is corroded, and the salt mist passes through the aging points of the paint surface and the weak points of the craft and produces a nuclear chemical reaction with the inner metal structure. This is the most important impact on product failure.

Board-level circuit corrosion generally occurs around the edge of the orifice ring. Because the internal stress in this place is larger than in other locations, the potential of the internal stress will be relatively high, and the potential of the location with low internal stress will be low, which constitutes the corrosion of the galvanic cell.

The inside of the chip is corroded, and the salt mist has less effect, and the chip is basically sealed. The effect is the working temp., humidity, power, and working time of the chip.

Ⅳ. The salt mist test capability of ORT

The device name/model

Technical specification

Salt Spray Test Chamber

A salt spray test chamber

1)Laboratory temperature range:+35℃~+50℃

2)Saturated barrel temperature:47℃~63℃

3)Saltwater temperature:+35℃~+55℃

4)Temp. undulation:≤±0.5℃

5)Temp. uniformity: ≤±2℃

6) Test time:0-999H 、M

7)Settlement amount:1-2mL/80cm2/h


Compound Salt Spray Test Room

Compound salt spray test room

1)Studio size:2)5m*2.0m*3.62m(W×L×H)

3)Temperature fluctuation: ±0.5℃

4)   Temperature uniformity:≤ 2℃

5)Temperature deviation: ±1℃

6)Spray deposition (m1/80cm2.h):1-2mL

7)Humidity range:20-98%

8)Spray pressure:1±0.01kgf/cm2

9)Test chamber capacity:18m3

10)Main functions of the equipment: Neutral salt mist, Alternating salt   fog

Ⅴ. ORT participated in the drafting of the published salt mist test standards

The units involved in drafting salt mist test standards

Salt Mist Test Standard

1. GB/T 35774-2017《运输包装件性能测试规范》

GB/T 35774-2017《Standard practice for performance testing of shipping containers》

2. GB/T 4857.1-2019《包装 运输包装件基本试验 第一部分:试验时各部位的标示方法》

GB/T 4857.1-2019《Packaging. Basic tests for transport packages. Part one: Identification of parts when testing》

3. GB/T 4798.1-2019《环境条件分类 环境参数组分类及其严酷程度分级 第1部分:贮存》

GB/T 4798.1-2019 《Classification of environmental conditions. Classification of groups of environmental parameters and their severities. Part one: Storage》

4. GB/T 2421-2020《环境试验 概述和指南》

GB/T 2421-2020《Environmental testing. General and guidance》

5. GB/T 2423.27-2020《环境试验 第2部分:试验方法 试验方法和导则:温度/低气压或温度/湿度/低气压综合试验》

GB/T 2423.27-2020《Environmental testing. Part two: Test methods.Test method and guidance: Combined temp. or temp. and humidity with low air pressure tests》

6. GB/T 2423.51-2020《环境试验 第2部分:试验方法 试验Ke:流动混合气体腐蚀试验》

GB/T 2423.51-2020《Environmental testing. Part two: Test methods. Test Ke: Flowing mixed gas corrosion test》

7. GB/T 32065.8-2020 《海洋仪器环境试验方法 第8部分:温度变化试验》

GB/T 32065.8-2020《Environmental test methods for oceanographic instruments. Part 8: Change of temp. test》

8. GB/T 32065.10-2020《海洋仪器环境试验方法 第10部分:盐雾试验》

GB/T 32065.10-2020《Environmental test methods for oceanographic instruments. Part 10: Salt fog test》

9. GB/T 4797.9-2021《环境条件分类 自然环境条件 贮存、运输和使用过程中测得的冲击和振动数据》

GB/T 4797.9-2021《Classification of environmental conditions. Natural environmental conditions. Shock and vibration data measured during storage, transportation and use》

10. GB/T 2423.33-2021《环境试验 第2部分:试验方法 试验Kca:高浓度二氧化硫试验》

GB/T 2423.33-2021《Environmental testing. Part 2: Test Method. Test Kca: High concentration sulfur dioxide》

11. GB/T 2423.18-2021《环境试验 第2部分:试验方法 试验Kb:盐雾、交变(氯化钠溶液)》

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

12. NB/T 10279-2019《输变电设备 湿热环境条件》

NB/T 10279-2019《Heat and hot environmental conditions for power transmission and transformation equipment》

13. NB/T 10280-2019《电网用状态监测装置 湿热环境条件与技术要求》

NB/T 10280-2019《Condition monitoring device for power grid, Humid and hot environmental conditions and technical requirements》

14. YZ/T 0174-2020《冷链寄递保温箱技术要求》

YZ/T 0174-2020《Technical requirements for cold chain delivery incubator》

15. T/CPF 0012-2020 《快递小型运输包装件试验导则》

T/CPF 0012-2020《Test guidelines for express small transport packages》

16. T/CPF 0011-2020《电商物流大家电运输包装件试验导则》

T/CPF 0011-2020《E-commerce logistics test guidelines for major appliances transport packages》

Tic Industry Testing Standard