Corrosion testing of automotive steel products
A number of bare and pre-coated steels are used in the automotive industry. The selection of these products for corrosion resistance will depend upon the vehicle environments in which they are exposed. To fill the gap between performance testing (e.g. salt spray tests) and the final corrosion behaviour to be expected in the vehicle, a research programme was carried out to achieve a new standard corrosion test from actual measurements of the corrosive conditions in running vehicles. A description of various microclimates (e.g. box section, door panel) in vehicles is given in terms of temperature, relative humidity, etc., over a period of one and a half years. A detailed chemical analysis of collected road dirt was carried out. Based on the measured data, a new cyclic corrosion test was formulated and applied to several automotive materials. The results in terms of millimetres of lacquer delamination in an outdoor exposure test and accelerated standard laboratory corrosion tests were compared with the results of the new cyclic corrosion test. The influence of certain parameters (cycle time, temperature, relative humidity and slush application) was investigated. A technique based on Weilbull statistics was applied to test results, to study the effect of time on delamination behaviour of the coating system. The results of a limited investigation of corrosion mechanisms (lacquer delamination) are summarised.
Bibliographic Reference: EUR 13504 EN (1991) 42 pp., FS, ECU 6.25
ISBN: ISBN 92-826-2660-1
Record Number: 199111286 / Last updated on: 1994-12-02
Original language: en
Available languages: en