Cyclic corrosion testing of materials & components in automotive construction.
The purpose of this test is to provide an accelerated test procedure for the assessment of the corrosion behaviour of components and of the corrosion protection provided by coating systems. The test method is based on real corrosive conditions and delivers differentiated results for a large number of uses in automotive applications
Test specimens are placed in an enclosed chamber, and positioned at an angle of 65° to 75° to the horizontal with the side to be tested uppermost. The salt spray phase is performed with a 1% solution of sodium chloride, (pH 6.5 to 7.2) and falls out onto the specimens at a rate of 2.0 to 4.0ml/80cm²/hour.
A full test cycle lasts 7 days and consists of:
Cycles A,B & C are multi step cycles consisting of varying degrees of temperature from -15°C to +50°C and humidity values of between 50% and 95%.
The typical test duration is six full test cycles. (6 Weeks)
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The VW Volkswagen PV 1078 Test Specification defines the assessment criteria for the corrosion resistance of surface-protected, Corrosive highly stressed chassis components based on iron materials, especially low-alloy steels, solid (e.g. subframes, wishbones, cross struts).
Its a two part test, a combination as follows:
- INKA Component Test
- Step 1 Dry phase @ 40°C/40%RH for 4 hours
- Step 2 Salt Spray Phase @ 35°C for 0.5 hours
- Step 3 Wetting Phase @ 40°C/95%RH for 7.5 hours
- Step 4 Dry phase @ 40°C/40%RH for 4 hours
- Step 5 Controlled Humidity @ 50°C/80%RH for 8 hours
- Alternating Climate Test in accordance with PV 1200 (+80°C/-40°C)
- Limit temperatures: 80°C and -40°C
- Holding time at limit temperature: 4 h
- Heating-up and cooling-down times: 2 h
- Relative humidity at 80°C/80%RH
Both the above tests can be ran in a single Ascott chamber
1 cycle lasts one week and is divided as follows:
A: A: B: B: A: A: A, where:
A = INKA component test,
B = storage according to PV 1200.
The start of the test is always “A” with 5 consecutive days.
The test duration for subframes and cavity-forming chassis parts is 6 cycles (this corresponds to 6 weeks).
this is a VW Volkswagen / Audi Test Standard. Also see PV 1209 & PV 1200.
The VW Volkswagon PV 1200 Test Specification describes an environmental cycle test (elevated temperature/low temperature cycle) for testing units, e.g. vehicle parts in the engine compartment.
The behaviour of the units and/or parts during environmental cycle stressing by means of cycling temperature and moisture shall be assessed here (e.g. susceptibility to cracks, deformation, separation of the composite material, etc.).
The purpose of the test specifications (e.g. temperature -40 °C) is to uncover component weaknesses in a short-term test with accelerated time effect, not to define general component requirements for continuous operation. This is a VW Volkswagon / Audi Test Standard. Also see PV 1209 % PV 1210.
Cyclic corrosion testing of materials & components in automotive construction.
The purpose of this test is to provide an accelerated test procedure for the assessment of the corrosion behaviour of components and of the corrosion protection provided by coating systems. The test method is based on real corrosive conditions and delivers differentiated results for a large number of uses in automotive applications
Test specimens are placed in an enclosed chamber, and positioned at an angle of 65° to 75° to the horizontal with the side to be tested uppermost. The salt spray phase is performed with a 1% solution of sodium chloride, (pH 6.5 to 7.1) and falls out onto the specimens at a rate of 2.0 to 4.0ml/80cm²/hour.
A full test cycle lasts 7 days and consists of:
Cycles A,B & C are multi step cycles consisting of varying degrees of temperature from -15°C to +50°C and humidity values of between 50% and 95%.
The typical test duration is six full test cycles. (6 Weeks)
Testing of Corrosion Protection of Vehicle Paint by Alternating Cycles Test
This test procedure has been developed to judge the corrosion protection of vehicle paint using an accelerated laboratory test. It is claimed that testing according to this procedure can generate results that correlate well with those seen by driven vehicles. 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. 24.0 hours exposure to salt spray according to DIN 50 021-SS. This is followed by 96.0 hours exposure to a condensing water climate according to DIN 50 017-KFW. This is followed by 48.0 hours exposure to an ambient climate of +18 to +28C according to DIN 50 014. The number of cycle repeats and therefore the test duration is variable.
Please see elsewhere in this document for details of DIN 50 021-SS, DIN 50 017-KFW & DIN 50 014.
This test is also referred to as a Cyclic Corrosion Test, often abbreviated to CCT.
For further information on VDA standards visit; www. vda.de
PV 1210 Climate Corrosion Test Cycle (VW/Audi)
This standard specifies a test method to determine the corrosion resistance of automotive bodies, 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 the following 3 part repeating cycle.
- 4.0 hours exposure to salt spray according to DIN 50 021-SS.
- followed by 4.0 hours exposure to an ambient climate according to DIN 50 014-23/50-2.
- followed by 16.0 hours exposure to a condensing water climate according to DIN 50 017-KK.
This 24 hour cycle is repeated for 5 days (nominally Monday to Friday). This is then followed by 48 hours (nominally a weekend) exposure to an ambient climate according to DIN 50 014-23/50-2, before the entire cycle repeats.
Please see elsewhere in this document for details of DIN 50 021-SS, DIN 50 014-23/50-2 & DIN 50 017-KK.
This is a VW Volkswagen / Audi test standard.
PV 1209 Climate Corrosion Test Cycle (VW/Audi)
This standard specifies a test method to determine the corrosion resistance of automotive condensers, water radiators and inter-coolers made of aluminium alloys. It is cyclic in nature, i.e.; test specimens are exposed to changing climates over time.
Test specimens are placed in an enclosed chamber (a separate salt mist chamber and controlled temperature/humidity chamber are generally used), and exposed to a changing climate that comprises of the following 2 cycles. 5 days exposure to the corrosion test cycle specified in P-VW 1210. This is followed by 2 days exposure to the alternating climate cycle specified in P-VW 1200. The number of cycle repeats and therefore the test duration is variable.
Please see elsewhere on this site for details of PV 1210 & PV 1200.
This is a VW Volkswagen / Audi test standard.
