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ASTM G85 Salt Spray Test

Abstract: 本文介绍了ASTM G85盐雾测试标准的细节。ASTM G85是对传统ASTM B117盐雾测试的改良版，提供了更为严苛的测试条件，如使用低pH值的测试溶液、在腐蚀性和中性气氛之间交替、以及应用腐蚀性电解质混合物。ASTM G85包含五个附件，每个附件对标准盐雾测试气氛进行了不同的修改，包括醋酸盐雾试验、循环酸化盐雾试验、海水酸化测试、SO₂盐雾试验和稀电解质循环雾干试验。这些改良测试方法旨在模拟更复杂的环境条件，以评估材料的耐腐蚀性能。在测试过程中，样品应以15°至30°角支撑或悬挂，以确保与雾流方向的平行性。

ASTM G85 is a standard practice for modified salt spray testing. Although ASTM G85 is based on ASTM B117, it provides more aggressive test conditions, such as using test solutions with lower pH values, alternating between corrosive and neutral atmospheres, or using corrosive electrolyte mixtures.


ASTM G85 consists of 5 appendices, each containing modifications to standard ASTM B117 atmospheres.

appendixRevise
A1Acetate salt spray test, continuous
A2Cyclic acidification salt spray test
A3Seawater Acidification Test, Cyclic (SWAAT)
A4SO 2 salt spray test, cycle.
A5Dilute electrolyte circulation fog dry test.

Appendix A5 is also called in the ASTM D5894 test.

Orientation: It is important to note that when testing in a salt spray cabinet, samples need to be supported or suspended between 15° and 30° from vertical, parallel to the main direction of mist flow through the chamber is recommended, based on the on the main surface being tested. Samples need to be supported by the bottom or sides.


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