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Evaluation of Corrosion Failure in Tractor-Trailer Brake System
| 题名： | Evaluation of Corrosion Failure in Tractor-Trailer Brake System |
| 作者： | Wilson, DF; |
| 关键词： | 36 MATERIALS SCIENCE; BRAKES; CALCIUM; CARBON STEELS; CHLORIDES; CLOTHING; CORROSION; CORROSION PRODUCTS; ELECTRONS; LINERS; MAGNESIUM; MAGNESIUM CHLORIDES; POTASSIUM; SODIUM; WATER |
| 摘要： | As reported to ORNL, concomitant with the introduction of different deicing and anti-icing compounds, there was an increase in the brake failure rate of tractor-trailer trucks. A forensic evaluation of a failed brake system was performed. Optical and scanning electron microscopic evaluation showed corrosion to be mostly confined to the brake table/lining interface. The corrosion is non-uniform as is to be expected for plain carbon steel in chloride environments. This initial analysis found no evidence for the chlorides of calcium and magnesium, which are the newly introduced deicing and antiicing compounds and are less soluble in water than the identified chlorides of sodium and potassium, in the scale. The result could be as a result of non-exposure of the examined brake table to calcium and magnesium chloride. The mechanisms for the increased failure rate are postulated as being an increased rate of corrosion due to positive shifts in the corrosion potential, and an increased amount of corrosion due to an increased ''time of wetness'' that results from the presence of hygroscopic salts. Laboratory scale evaluation of the corrosion of plain carbon steel in simulated deicing and anti-icing solutions need to be performed to determine corrosion rates and morphological development of corrosion product, to compare laboratory data to in-service data, and to rank economically feasible replacement materials for low carbon steel. In addition, the mechanical behavior of the lining attached to the brake shoe table needs to be assessed. It is opined that an appropriate adjustment of materials could easily allow for a doubling of a brake table/lining lifetime. Suggestions for additional work, to clarify the mechanisms of rust jacking and to develop possible solutions, are described. |
| 报告类型： | 科技报告 |
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