科技英语一篇,关于bonazinc Unknown 2012/11/07

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下面是一篇科技英语,描述的是关于Mercedes-Benz车上出现掉漆导致腐蚀现象和原因分析。

http://www.honestjohn.co.uk/forum/post/index.htm?t=49706

The rust problems on MB cars are not traditional tin worm (i.e. perforation from within) they are due to poor adhesion of the primer coating under the paint. I think the move to water-based primer coatings was around 1995.

MB used to use an epoxy-based weldable primer coating (Bonazinc) which is supposed to have a 30 year life. The snag with Bonazinc is that it has a relatively high resistance and so welder tip erosion is high. Also it needs a high curing temperature. They moved to a water-based primer to get around these problems - but unfortunately the results have turned out to be a bit 'unpredictable'. This was coupled with a move to water-based top coats and they put them on very thin (100um, as opposed to a more typical 250um). So you have a less stable primer coating and a thinner and harder top coat which made chipping more likely.

I think when the corrosion problems came to light initially, MB were fairly generous and would replace panels without argument. As more problems came out of the woodwork they have toughened up and now a lot of cars seem to get a flatting down and a blast with the spray gun - just delays things. Note that the MB warranty (as I understand it) covers perforation and not corrosion due to chipping etc.


【注释】

        
  • tin worm - 一种金属板金上容易出现的腐蚀。在google上输入tin worm,会找到很多相关的图片。
  •     
  • perforate - (动词) 穿孔。名词是perforation。
  •     
  • within - (名词)内部。perforation from within,从内部穿孔。
  •     
  • primer coating - 粘接层,底漆
  •     
  • water-based primer coating - 以水为主的底漆。类似的还有solvent-based primer coating,以溶剂为主的底漆。
  •     
  • expoxy-based weldable primer coating - 以环氧树脂为主的底漆。
  •     
  • be supposed to - 应当,应该,被认为
  •     
  • snag - (名词)障碍
  •     
  • welder tip erosion - 电焊机焊接尖端部腐蚀(此处是因为bonazinc电阻较高,焊接时需要更大的电流,温度较高,导致电焊机焊接尖端部会被部分腐蚀)。
  •     
  • curing temperature - 硬化温度、固化温度。
  •     
  • get around - 绕开走,避免,避开。
  •     
  • be coupled with - 同时伴随着……。
        
  •     
  • as opposed to - 与……形成鲜明对照的是,……
        
  •     
  • chipping - (名词)(漆等)剥落
        
  •     
  • come to light - 暴露,真相大白
        
  •     
  • toughen up - 强硬,变得坚强
  •     
  • a blast with the spray gun - 用水枪(或类似别的液体)强力冲洗

以上粗体字是我认为比较重要的词汇,大家可以记得。

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