Salt spray test
Tianjin Rong Da Testing Co., Ltd. contact: Wang Jingfu
Cell phone: 13102238283 QQ:3144667033
Telephone: 022-23892103
Salt spray test is a kind of environmental test, which is mainly used to test the corrosion resistance of products or metal materials by artificial simulation of salt spray environment created by salt spray test equipment.
Corrosion is the destruction or deterioration of materials or their properties under the action of the environment. Most of the corrosion occurred in the atmospheric environment, the atmosphere contains oxygen, humidity, temperature changes and pollutants, such as corrosion factors and corrosion factors. Salt spray corrosion is one of the most common and destructive atmospheric corrosion.
Salt spray test is a kind of artificial accelerated ageing test for metal products, aluminum zinc alloy, magnesium alloy, coating, coating and so on. For the above materials for quality assessment and failure verification under atmospheric corrosion conditions. The main component of salt spray corrosion is sodium chloride, which is common in the marine and inland saline areas.
First, the principle of salt spray corrosion:
Chloride ion in sodium chloride through the surface of the oxide layer and protective film and metal ion redox reaction, resulting in the appearance of the material and its properties were destroyed. At the same time, the chloride ion itself contains a part of hydration energy, easy to be microporous adsorbent surface and the gap, so that the oxygen chloride ion substitution protective film, the insoluble oxides become soluble chlorides, passing the oxidizing layer protection, metal surface into chemical active surface, caused a certain degree of damage of materials or products. The accelerated salt spray test is necessary, simulating damage to ocean or inland saline areas of natural environment on material, ability to examine the protective film material and its corrosion resistance to salt fog, and the process of similar protective film, quality evaluation.
Two, salt fog test classification:
Neutral salt spray test (NSS test)
Salt spray test (ASS test)
Copper salt accelerated salt spray test (CASS test)
Alternating salt spray test
Three, salt spray test standards:
9227-2012 ISO; 2423.17-2008 GB/T (Kb); 2423.17-2008 GB/T (Ka); 10125-2012 GB/T
Four, salt spray test results analysis:
Key points:
In the analysis should pay particular attention to distinguish between white, white rust and salt flow, the two can not be included in the percentage. Distinguish between salt flow and white rust method: if you can wash, it is not white rust, because the white rust is the corrosion of the shell material itself, generally do not go out, wash off mostly salt flow.
Face：
We are the salt spray test judgment refers to all the work surface, such as screw thread, cross slot; large part shaped piece, but does not include the side, because the process of relationship between zinc plating, coating thickness of the plating to the small side face to face than small, rust quickly. So before the experiment, the subjects were clear where is the working face, and noted in the report