This is an accelerated laboratory corrosion test method that can be used to determine the corrosion resistance of automotive assemblies and components. It is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.
Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of a relatively short period of salt spray, followed by exposure to hot/humid and hot/dry atmospheres. The entire test cycle comprises of a main cycle and a sub-cycle. 1 entire test cycle takes 24 hours to execute. The number of entire cycle repeats and therefore the test duration is variable.
The main test cycle begins with 10 minutes exposure to a continuous indirect spray of salt water solution, in a chamber temperature of +50°C. This is followed by 155 minutes of air drying at +60°C. This is followed by 75 minutes exposure to a high humidity climate of 95%RH at +60°C.
This is then followed by a repetitive sub-cycle comprising of 160 minutes of exposure to an air drying at +60°C, followed by 80 minutes exposure to a humid climate of 95%RH at +60°C. This sub-cycle is repeated 5 times in total and then the chamber is conditioned to +50°Cfor up to 10minutes before the main test cycle starts again.
IEC 60068-2-52
Test specimens are placed in an enclosed chamber (a separate salt mist chamber and controlled humidity chamber are generally used) and exposed to a changing climate that starts with 2 hours exposure to a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +15 to +35°C. Depending upon method number, this is followed either by exposure to a high humidity climate of 40°C / 93%RH; or air drying at 60 °C, under 30 % RH and then Wetting at 50°C.
The proven test methodolgy can be downloaded here
The duration of high humidity and number of cycle repeats is variable depending on the test method (1-8).
Test method 1
One cycle consists of spraying samples with salt solution at 35 °C for 2h, followed by controlled humidity at 40 °C, 93% RH for six days and 22 h. The required number of cycles is four (28 days).
Test method 2
One cycle consists of spraying samples with salt solution at 35 °C for 2h, followed by controlled humidity at 40 °C, 93% RH for 22h. The required number of cycles is three (3 days).
Test method 3
One cycle consists of spraying samples with a salt solution at 35 °C for 2h, followed by controlled humidity at 40 °C, 93% RH for 22h. This shall be repeated four times. The test specimens shall then be stored under standard atmosphere at 23 °C and 50 % RH for three days. The required number of cycles is one (seven days).
Test method 4
The required number of cycles as specified in test method 3 shall be two (14 days).
Test method 5
The required number of cycles as specified in test method 3 shall be four (28 days).
Test method 6
The required number of cycles as specified in test method 3 shall be eight (56 days).
Click here For information on test methods 7 & 8
ISO 60068-2-52
Test specimens are placed in an enclosed chamber (a separate salt mist chamber and controlled humidity chamber are generally used) and exposed to a changing climate that starts with 2 hours exposure to a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour, in a chamber temperature of +15 to +35°C. Depending upon method number, this is followed either by exposure to a high humidity climate of 40°, C93%RH; or air drying at 60 °C, under 30 % RH and then Wetting at 50°C.
The duration of high humidity and number of cycle repeats is variable depending on the test method (1-8).
Test method 7
One cycle is 8 h. One cycle shall consist of spraying the specimen with salt solution at 35 °C for 2 h, followed by the dry condition at 60 °C, under 30 % RH for 4 h and then the humid condition at 50 °C, over 95 % RH for 2 h.
The transition times (time allowed to reach the temperature and relative humidity specified for a condition after changing to that condition) for temperature and humidity shall be specified between the following choices and reported: – salt mist to dry condition: within 30 min or between 30 min and 60 min; – dry condition to humid condition: within 15 min or between 15 min and 30 min; – humid condition to salt mist: within 30 min. Those transition times shall be included in the next condition period of the pair, for example the salt mist to dry condition transition time is included in the period of the dry condition. Spraying the specimen with a salt solution begins instantaneously once the salt mist is started.
The recommended number of cycles are 3 (1 day), 6 (2 days), 12 (4 days), 30 (10 days), 45 (15 days), 60 (20 days), 90 (30 days), 150 (50 days) and 180 (60 days).
Test method 8
One cycle is 8 h, as specified in test method 7 using acidified salt solution instead of neutral salt solution.
The recommended number of cycles is the same as in test method 7
Cosmetic Corrosion Lab Test
The SAE J 2334 Method B procedure has been field correlated, so it is claimed that the results obtained should correlate well to those obtained due to natural exposure, under severe corrosive conditions. It can therefore be used as a validation and development tool for automotive paint systems. This test is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.
SAE J 2334 has three methods of achieving the standard, this page is describes the procedure described in Method B.
The test specimens are placed in an enclosed cyclic corrosion chamber and exposed to a changing climate that comprises of the following 3 part repeating cycle:
- 6.0 hours exposure to a water fog/condensing humidity climate of 100%RH at +50C.
- followed by 15 minutes or a direct spray of salt water at ambient temperature to thoroughly wet the test samples
- followed by 17 hours 45 minutes of air drying in a climate of 50%RH at +60C.
The number of cycle repeats and therefore the test duration is variable.
This test is also referred to as a Cyclic Corrosion Test, which is often abbreviated to CCT, further information on our Cyclic Corrosion Test Chambers and how they work can be found here
For further information on SAE standard please visit; www.saej2334.com
For further information on SAE J 2334
Please contact Ascott Analytical via our contact us page or call our experiences technicians on 01827 318044
Cosmetic Corrosion Lab Test
SAE J 2334 Method A has been field correlated by comparisons between laboratory test results and corrosion in real world applications. It is claimed that the results obtained should correlate well to those obtained due to natural exposure, under severe corrosive conditions.
It can therefore be used as a validation and development tool for automotive paint systems. This test is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.
Test specimens are placed in an enclosed chamber and exposed to a changing climate that comprises of the following 3 part repeating cycle.
6.0 hours exposure to a water fog/condensing humidity climate of 100%RH at +50C. This is followed by 15 minutes immersion in (or a direct spray of) salt water at ambient temperature.
This is followed by 17 hours 45 minutes of air drying in a climate of 50%RH at +60C. The number of cycle repeats and therefore the test duration is variable.
This method is also referred to as a Cyclic Corrosion Test, often abbreviated to CCT.
For further information on SAE standards visit; www.sae.j2334.com
Further information on SAE J 2334 Method A
For Further info please contact Ascott Analytical via our contact page.
Toyota Laboratory Accelerated Cyclic Corrosion Test
This test procedure serves as a general purpose atmospheric corrosion test and can be applied to a wide variety of materials, coatings and interactions of materials.
It has been developed to allow the evaluation of the corrosion resistance of metals used in vehicle bodies where there is a significant influence of chloride ions, mainly as sodium chloride from winter road de-icing salt. This test is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.
Test specimens are placed in an enclosed chamber and exposed to a changing climate.
Method C comprises the following 24 hour profile
- 4 hours saltwater spraying @ 50°C
- 5 hours forced drying @ 70°C / <30%RH
- 12 hours wetting @ 50°C / 85-90%RH
- 2 hours forced drying @ 70°C / <30%RH and
- 1 hour natural drying in ambient conditions
The number of cycle repeats and therefore the test duration is variable.
The test allows for 30 mins transition time between each of the above steps and is commonly referred to as Toyota CCT-C
Jaguar Land Rover Laboratory Accelerated Cyclic Corrosion Test
TPJLR.52.265 is a Cyclic Corrosion Test Standard from JLR that applies to components, assemblies and sub-assemblies used in all JLR vehicles where the corrosion resistance (cosmetic or perforation) of metals and interacting materials needs to be evaluated.
TPJLR.52.265 has been developed to allow the evaluation of the corrosion resistance of metals in environments where there is a significant influence of chloride ions, mainly as sodium chloride from a marine source or by winter road de-icing salt. This test is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.
Test specimens to be evaluated are placed in an enclosed chamber and exposed to a changing climate. The 24 hour test cycle consists of a 6 hour wet phase at 25 °C ±2 °C with intermittent salt spray, a two-step transition phase with drying under climate control (2.5 hours) and a 15.5 hour phase at constant temperature and humidity (50 °C ±1 °C, 70% ±3% RH).
The 24 hour profile is then repeated for the specified number of cycles.
Ref: JLR Corrosion Test, Jaguar Corrosion Test, TPJLR52265, JLR52265, TPJLR-52-265
This test is also referred to as a Cyclic Corrosion Test, often abbreviated to CCT.
This information was correct at time of writing and may have since varied.
Ascott Analytical provides a wide range of different sized equipment to fulfil this standard that will also fulfil many other standards using the same equipment. Further accessories can be added to widen this scope of test standards the equipment can be used to achieve as well of a range of jogs and fixtures for holding your materials during testing. Data Logging software applications and other useful testing tools are also an option.
For further Information:
Please contact Ascott Analytical via our contact page
Hyundai/Kia CCT-B
An accelerated corrosion test under complex environment shall be performed in accordance with CCT-B of MS600-66
Step 1: Salt Spray @ 35C / 95% RH for 4 hours
Step 2: Drying @ 70C / 30%RH for 2 hours
Step 3: Wetting @ 50C / 95%RH for 2 hours
Step 4: Ambient Drying @ 25C / 60%RH for 1.5 hours
Step 5: Cooling @ -20C for 2.5 Hours
Transition times:
From step 1 to step 2 = 30 minutes
From step 2 to step 3 = 20 minutes
From step 3 to step 4 = 20 minutes
From step 4 to step 5 = 60 minutes
From step 5 to step 1 = 20 minutes
The entire cycle is 12 hours and repeatable
Determination of the resistance of organic coatings to the propagation of bubble under skin corrosion
Fiat 50493
also known as SCAB indoor corrosion test
1 hour humidity test at 55°C / 95% RH
Followed by 40 minutes of temperature controlled air drying @ 55°C / 55-60% RH
The air drying stage needs to be reached within 20 minutes