TEST WITH UNSALTED ROADS DURING THE WINTER 1981/82. THE EFFECT OF DEICING SALT ON CAR CHASSIS

FOERSOEK MED OSALTADE VAEGAR VINTERN 1981/82. VAEGSALTETS KORROSIONSBEFRAEMJANDE EFFEKT PAA BILUNDERREDEN

An investigation into the corrosive influence of road salt (NaCl) on the underparts of vehicles has been made by exposure of mobile specimens and test panels on two road sections, a and c, completely without de-icing and two road sections, b and d, which were treated with de-icing salt in the normal way. The investigation also included the effect of de-icing to a reduced extent by two different alternatives, ab and cd. Alternative ab simulated selective de-icing on limited sections during the whole season and cd de-icing only in the beginning and at the end of the season i.e. Autumn and late winter. Untreated, anti-corrosive treated and painted specimens and panels made from automobile body steel sheet were exposed to the different conditions. The result can be summarized as follows: there is a very strong correlation between the frequency of de-icing salt and metal loss for the untreated and painted plates. The corrosion rate on the salted roads was on average four times as high as on the unsalted roads. There is also a correlation between the exposure to wetness and metal loss for the untreated and painted plates. Road salt has caused more rapid degradation of the coating and increased the spreading of rust. The anti-rust agent treated samples were just slightly degraded during this experimental winter season. Road dust and sanding is a probable cause of the difference between the two unsalted road sections. On the road section c, which has been sanded nearly four times more than section a, the metal loss of the untreated plates was significantly higher, and more peeling and rust occurred on the painted anti-corrosive plates. Reduced salting as in alternative ab did not give any reduction in corrosion or degradation of the coating or anti-rust agent. Reduced salting as in alternative cd gave less corrosion of the untreated steel, whereas the degradation of the paint and of the anti-rust agent was of the same extent as in the case of normal salting. The atmospheric corrosion of the reference samples was not correlated to the corrosion of the mobile specimens during this investigation. (Author/TRRL)

Language

  • Swedish

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00381104
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS
  • Created Date: Apr 30 1984 12:00AM