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1959年加拿大铁路发现罐车在运用中其罐筒内表面的保护层迅速腐坏,这引起了铁路研究部门的重视。从1960年起,曾对50多辆漏斗车的内表面作了广泛试验,试验车的内表面涂了约12种环氧和氨基甲酸乙酯(俗称尿烷)的工业产品,结果保护层的寿命几乎延长一倍。可是,在这方面要定出一个使用期限是不易的,因为这涉及到许多不定的因素。例如,过去装运水泥时,常因粘附在车的内表面,使货物不易卸完,因而需要做大量的清扫工作,而装运麦芽时,对于保护层的作用就不象水泥那样严重。不过,从现场试验所得到的一个较保守的估计是这种保护层的使用寿命可以延长一倍,这样,就降低了维修费用。
In 1959, the Canadian Railways found that the rapid deterioration of the protective coating on the inner surface of the tank during the operation of the tanker caused the railway research department’s attention. Since 1960, extensive testing has been conducted on the interior surface of more than 50 hopper cars, which have been painted with about 12 industrial products of epoxy and urethane (commonly known as urethanes), as a result of which Life expectancy almost doubled. However, it is not easy to set a deadline in this respect as it involves many uncertainties. For example, in the past, when cement was used, it often adhered to the inner surface of the car to make it difficult for the cargo to be discharged. Therefore, a large amount of cleaning work was required. When loading the malt, the protective layer was not as severe as the cement. However, a more conservative estimate from field tests is that the service life of this protective layer can be doubled, thus reducing maintenance costs.