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.
SAE J2635 – Cosmetic Corrosion Test for Wheel Finishes
SAE J2635 is an automotive corrosion test standard developed by the SAE International to evaluate the cosmetic corrosion resistance of coated aluminium road wheels and wheel covers.
The standard defines a laboratory-based accelerated corrosion procedure designed to simulate the combined effects of road salt, moisture, and environmental exposure encountered during vehicle service. It is primarily used by automotive OEMs and wheel manufacturers to assess the durability and visual performance of decorative and protective wheel finishes.
Test Overview
SAE J2635 typically incorporates:
- Controlled salt solution exposure (In accordance with CASS Test ASTM B368)
- Post Inoculation Rinsing
- Temperature & Humidity controlled environments
- Defined inspection and evaluation criteria
The method focuses on identifying:
- Filiform corrosion
- Creepage from scribe lines
- Blistering and coating delamination
- Cosmetic degradation of painted or coated surfaces
Chamber Requirements
SAE J2635 testing requires precise environmental control and reliable cyclic corrosion performance to replicate real-world exposure conditions. Modern cyclic corrosion chambers are typically used to ensure repeatability, compliance, and accurate environmental simulation.
The cabinet should be capable of maintaining the following parameters:
- Temperature: 60° Celsius ± 1 Celsius
- Humidity: 85% Relative Humidity ± 3%
- Air Flow :6 to 24 meters/minute (20 to 80 ft/min) in the test area
Why SAE J2635 Testing Matters
For automotive manufacturers, maintaining the visual quality of wheels throughout the vehicle’s service life is critical to brand perception and warranty control. Compliance with SAE J2635 helps ensure:
- Long-term cosmetic durability
- Resistance to aggressive road salt environments
- Consistent coating system performance
- Reduced field failure and warranty claims
Cosmetic Corrosion Lab Test
This test 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.
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 test is also referred to as a Cyclic Corrosion Test, often abbreviated to CCT.
For further information on SAE standards visit; www.sae.org