Most of the neutral salt spray test standards used in the coatings industry are GB/T1771-1991 (determination of neutral salt spray resistance of paints and varnishes), ASTMB117-1997 (test method standard salt spray test).
In the standard GB/T1771-2007 and ASTMB117-2011, the specific conditions for the test conditions are as follows:
GB/T1771-2007 standard requirements: salt solution concentration 50 ± 10g / L, pH 6.5 ~ 7.2, spray volume 1 ~ 2ml / 80cm2 · h, spray pressure 70 ~ 170kPa, spray chamber temperature 35 ± 2 ° C.
ASTMB117-2011 standard requirements: salt solution concentration 5 ± 1%, pH value 6.5 ~ 7.2, spray amount 1 ~ 2ml / 80cm2 · h, spray pressure 69 ~ 172kPa, spray chamber temperature 35 ± (1.1 ~ 1.7) ° C.
It can be seen from the test conditions listed in the above salt spray corrosion test chamber standard that the two standards have basically the same requirements for the main test conditions, which guarantees the consistency of the test results of different laboratories in implementing different standards.
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