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Test standard Regulations of sodium chloride solution :
The reagents used in this experiment use reagents with chemical pure or chemical pureness. At a temperature of no more than 20 μs/cm at a temperature of 25 ± 2 ° C or sodium chloride dissolved in ionic water, the concentration concentration is 50 g/L ± 5 g/L. The concentration of spray liquid collected should be 50 g/L ± 5 g/L. At 25 ° C, the dense solution density is within the range of 1.029 ~ 1.036.
The copper content in sodium chloride should be less than 0.001%(mass score), and the nickel content should be less than 0.001%(mass score). The content of copper and nickel is determined by the atomic absorption of the lighting method or other analysis methods with the same accuracy. The content of sodium iodide in sodium chloride should not exceed 0.1% (mass score) or the total impurities calculated in dried salt should not exceed 0.5% (mass score).
Note: If the pH value of a solution prepared at 25 ° C ± 2 ° C exceeds the range of 6.0 ~ 7.0, the salt or water should contain unnecessary impurities in salt or water.
1. Neutral salt fog test (NSS test)
The pH value of the test solution should be adjusted to salt fog box The pH value of the collected spray solution is between 6.5 ~ 7.2. The measurement of the pH value should be measured at 25 ° C ± 2 ° C, and the precision pH test strip with measurement accuracy of not more than 0.3 can be measured at 25 ± 2 ° C for daily testing. When the range is beyond the range, you can add analysis of pure hydrochloric acid, sodium hydroxide or sodium bicarbonate for adjustment.
Carbon dioxide loss in the solution during spray may cause changes in pH. Corresponding measures should be taken, for example, heating the solution to more than 35 ℃ , to reduce the carbon dioxide content in the solution , pH value. 2. Test (AASS Test)
Add an appropriate amount of methamphetamine in the salt solution prepared as required, To ensure that the pH value of the collection liquid in the salt fog box is 3.1 ~ 3.3. If the pH value of the first prepared solution is 3.0 ~ 3.1, the PH PH of the collection liquidThe H value is generally in the range of 3.1 ~ 3.3. The measurement of the pH value should be measured at 25 ° C ± 2 ° C, and the precision pH test strip with measurement accuracy of not greater than 0.1 can also be used for daily detection. The pH value of the solution can be adjusted with methamphetamine or sodium hydroxide.
3. Copper accelerated ethyl acetate fog test (CASS test)
In the salt solution prepared according to the requirements, add copper chloride to copper chloride (CUCL2 ● 2H2O), its concentration is 0.26 g/L ± 0.02 g/L (ie
0.205 g/L 0.015 015 G/L copper -free copper chloride ) . pH The value adjustment method is the same as that of Type of acetate fog test .
Spray test machine, salt fog test machine, and salt fog test box are one of the three defense (damp heat, salt fog, mold) test equipment for the artificial climate environment. An important test equipment for environmental adaptability and reliability has significant advantages: corrosion environment can be controlled, environmental reproduction is good; the test time is significantly shortened; it saves a lot of manpower, financial resources, and material resources.
salt fog corrosion tests as well as products, components, metal materials and products of automobiles, aviation, military equipment, hardware tools, etc.
Meeting test standards and testing methods: 1.ASTM/B117-2011 Salt Mogo Test 2.gjb150.11_1986
salt fog test< style=font-size: 18px;> 3.GB-T10125-2012 artificial atmosphere corrosion test salt fog test
4. GBT2424.17-2008 salt fog test method
5.GB-T5170.8-2008_Cathematics and electronic product environment test equipment testing methods ___
salt fog test equipment
6.gjb150.11a-2009 military equipment laboratory environment test method for salt salt salt salt salt salt salt saltFog Test
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