There are many ways to describe the experimental results of the salt spray test in the salt spray test box, such as: according to the characteristics of the corrosives, according to the percentage of the corrosion area, according to the corrosion rate, according to the weight increase and decrease, according to The experience classifies the degree of corrosion and expresses it. Let's introduce these methods.
1. According to the characteristics of corrosion
This method is based on the appearance characteristics of the corrosion products after the salt spray test. The standards for using this method are: JB4159-1999 "General technical requirements for tropical electrical products"; GJB4.11-1983 "Environmental test salt for marine electronic equipment Fog Test "; GB / T4288-2003" Household Electric Washing Machine ", etc.
2. Expressed as a percentage of corrosion area
This method is suitable for flat samples. If the test time is short or the sample shape is complex, the corrosion area is more difficult to determine.
The standards for this method are: GB / T6461-2002 "Rating of samples and test pieces after corrosion test of metals and Other inorganic coatings on metal substrates", etc.
3. According to weight increase and decrease
This method is based on the change in the weight of the sample caused by the corrosion. The weight change of the sample before and after the test is divided into the weight loss method and the weight increase method. Both methods usually use flat samples. The weightlessness method is a kind of expression method that uses a chemical solvent that can dissolve corrosive substances and at the same time has no chemical reaction to the sample itself to dissolve the corrosive substances on the sample after the test and make the weight of the sample after the test lighter than before the test. The weight loss method is expressed as: the value of the weight lost per unit sample area after the test. The weight gain method directly measures the value of weight gain per unit sample area after the test.
4. According to the corrosion rate
The standard for this method is ASTM B537-1970 "Standard Practice for Rating of Electroplated Panels
Subjected to Atmospheric Exposure, etc.
5. According to experience, the degree of corrosion is expressed
This method is based on the actual work experience to divide the corrosion degree of the sample after the salt spray test, which is a very rough expression method. The following statements are usually used: very severe corrosion, severe corrosion, moderate corrosion, slight corrosion, very slight corrosion, good appearance, etc.
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