VDA233-102 Cyclic corrosion testing of materials and components in automotive construction
0 Preface
This specification has been created jointly by the automotive, steel and aluminum industry.
To document the close cooperation during the development of this agreed upon laboratoryscale cyclic corrosion test for the development of new materials and coatings for applications in the automotive industry, this specification is published with identical content as both StahlEisen-Prüfblatt 1850 and VDA-Recommendation 233-102.
1 Purpose and scope
The purpose of this specification 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 accelerated
test covers in particular the delamination/corrosion creep around a defined artificial
defect in a coating as well as surface and
edge corrosion on special test plates, bonding specimens or components. Compared to tests with a higher humidity availability a decreased ageing rate of adhesive is to be expected.
This laboratory-scale cyclic corrosion test is also suitable for assessing perforation corrosion in flanged areas or gaps and of unpainted surfaces.
This method induces corrosion processes and generates reproducible corrosion patterns which correlate well with the results obtained in natural weathering tests (DIN 55665) and driving operation. In particular, the corrosion patterns for the substrates steel, galvanised steel and aluminium closely reflect real-life phenomena. The test method is based on real corrosive climate conditions and delivers differentiated results for a large number of uses in automotive applications.
1.2. Disclaimer
The VDA recommendations are recommendations that are available for anyone to use. Anyone using these recommendations is responsible for ensuring that they are used correctly. The VDA recommendations give due consideration to the prevailing state-of-the-art at the time of publication. Use of the VDA recommendations does not allow a person to avoid assuming responsibility for his or her actions. In this respect, everyone acts at their own risk. The VDA and the parties involved in drawing up the VDA recommendations assume no liability whatsoever. We request that anyone encountering an error or the possibility of an incorrect interpretation when using the VDA recommendations contacts the VDA immediately so that any errors can be rectified.
The document is a translation of the German version. Therefore the German document represents the original and should be referenced in the case of discrepancies. Due to the fact that this document is a translation, it may be the case that the English text leaves room for interpretation because certain terms are often deeply rooted in the original language, and therefore it is not possible to translate them into another language without a certain degree of ambiguity arising.
2 Standards
DIN EN ISO 4628-8
Paints and varnishes – Evaluation of degradation of coatings – Designation of quantity and
size of defects, and of intensity of uniform changes in appearance -Part 8: Assessment of degree of delamination and corrosion around a scribe or other artificial defect
ISO 8573-1
Compressed air – Part 1: Contaminants and purity classes
DIN EN ISO 9227
Corrosion tests in artificial atmospheres – Salt spray tests
DIN EN 10130
Cold rolled low carbon steel flat products for cold forming
DIN 55665
Beschichtungsstoffe – Freibewitterung von Beschichtungen – Prüfung des Korrosionsschutzverhaltens
ISO 8407
Corrosion of metals and alloys – Removal of corrosions products from corrosion testspecimens
SEP 1160/Part 1
Evaluation of Weldable Corrosion Protection Primers for the Automotive Industry,
Part 1: Corrosion Performance
3 Equipment and consumables
– Programmable corrosion test chamber
– Temperature and relative humidity monitoring using a data logger
– Monitoring of constant testing conditions by means of mass-loss specimens
– Measuring cylinder plus funnel
– pH meter
4 Corrosion testing
The correct execution of VDA 233-102 requires a programmable test chamber allowing
continuous programming of temperature, relative humidity and salt spray.
The test should be carried out in a combination chamber allowing all programmed climates to be run, in order to ensure minimal disturbance of the climates. In exceptional cases, the test may also be conducted in several chambers.
All parts of the test equipment that come into contact with the salt spray atmosphere, condensate or test solutions shall be made of a material that is resistant to attack by the test
media and does not itself affect the action of the test solutions or the salt spray/condensate.
The test chamber design shall include equipment for cooling, heating, and pressure compensation, as well as the necessary instrumentation and control equipment to set and
maintain the climate data [temperature (DT=±2) °C, relative humidity (DRH=±3) %] in
the closed chamber at defined temperature/humidity points. A rate of temperature change of 1,5 K/min is recommended.
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