The following standard test methods are the latest circulating salt spray corrosion test standards for the automotive industry, please visit:
CCT-1:
This is a laboratory accelerated corrosion test method that can be used to determine the corrosion resistance of automotive components and parts. Its nature is that the cycle test sample is exposed to a climate that changes with time. The sample is placed in a closed cavity and exposed to climate change. It includes the following 3 parts to repeat the cycle:
4 hours of exposure to a continuous intermittent spray of neutral (pH value 6.5 to 7.2) saline solution, which belongs to the elimination rate of 1.0 2.0ml / 80cm 2 / hour, the standard test is performed at a room temperature of 35 degrees, followed by 2 hours at 60 degrees / 20% to 30% RH climate dry air test, and then 2 hours of condensed water climate exposure (wetting) 95% to 100% RH repeated at 50 degrees cycle, so the number during the test is Variable, the maximum transition time between the various parts of the test cycle is also specified as follows:
Spray from salt into the air to dry within 30 minutes.
Wet within 15 minutes from air drying.
Spray from wetting salt within 30 minutes.
CCT-2
This is a laboratory accelerated corrosion test method that can be used to determine the corrosion resistance of automotive components and parts. Its nature is that the cycle test sample is exposed to a climate that changes with time. The sample is placed in a closed cavity and exposed to climate change, including the following 3 parts. Repeat the cycle. 2 hours exposure to a continuous contact spray neutral (pH value 6.5 to 7.2) saline solution, which belongs to the elimination rate of 1.0 2.0ml / 80cm 2 / hour, calibrated in the 35 degree test chamber. Followed by 4 hours at 60 degrees. 20% to 30% RH climate dry air, then 2 hours of condensed water climate exposure (wetting) 95% to 100% RH at 50 degrees. The cycle repeats, so during the test The quantity is variable, and the maximum transition time between the various parts of the test cycle is also specified as follows:
Spray from salt into the air to dry within 30 minutes.
Wet within 15 minutes from air drying.
Spray from wetting salt within 30 minutes.
CCT-4
This is a laboratory accelerated corrosion test method that can be used to determine the corrosion resistance of automotive components and parts. Its nature is that the cyclic test sample is exposed to a climate that changes with time. The test sample is placed in a closed cavity and exposed to a relatively short period of time. It is exposed to hot / humid and hot / dry environments. Salt spray includes Climate change, the entire test cycle includes a main cycle and a sub-cycle, the entire test cycle takes 24 hours to execute, repeat the entire cycle, so the number during the test period is variable, indirect injecting saline solution for 10 minutes of exposure The chamber temperature is at 35 degrees and the main test cycle begins. The second is 155 minutes of air drying at 60 degrees. The second is 75 minutes of exposure to 60 degrees. The high humidity climate of 95% relative humidity is followed by a repeated sub-cycle, including 160 minutes of exposure to +60 degrees of dry air for 80 minutes To 95% RH at 60 degrees. The climate is exposed to humidity, the cycle is repeated 5 times in total, and it is started again before the main test cycle.
Circulating salt spray test chamber—American General Motors Standard (GM 9540 / B)
Through the SAE ACAP committee of the American Society of Automotive Engineers and the AISI of the American Iron and Steel Institute, this is currently one of the preferred CCT methods for automotive surface corrosion (top coating or pre-coated metal sheet).
GM 9540P / B requires manual testing according to a 24-hour work cycle every day, or the use of an automatic cycle test box. If it is manual operation, it is necessary to use a sprayer to spray the sample until it is completely wet. The parts must be dry before being sprayed. If it is manual operation, the sample can only be exposed to laboratory conditions during the weekend, automated testing The device can complete the exposure test in a test box.
GM 9540P / B exposure conditions include: electrolyte 0.9% NaCl, 0.1% CaCl2 & 0.25 NaHC03 solution acidity pH value between 6.0 and 8.0, test period 80 test cycles (1920 hours). The GM9540P / B exposure test cycle is as follows:
8 hours of salt spray, laboratory environment (25 ℃, relative humidity 30 ~ 50%)
8 hours of humidity (relative humidity 95 ~ 100%)
8 hours dry (60 ℃, relative humidity <30%)
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