引言毫无疑问,双层镍的研制成功已在提高镍、铬沉积层的防腐蚀能力方面,向前迈出了极其重要的一步.继之而来的是各种各样的多层镍沉积的方法,然而有一个问题却变得越来越清楚,即只有改善铬的沉积,才可能进一步获得更好的防腐效果.铬通常都复盖着一层极薄的、钝态的氧化膜,正因为如此,铬在正常情况下对于大多数大气腐蚀环境,表现很稳定.可是众所周知,一般的铬在沉积时都避免不 Introduction There is no doubt that the successful development of double-layer nickel has taken an extremely important step toward improving the corrosion protection of nickel and chromium deposits, followed by a wide range of multi-layer nickel deposits However, one issue has become clear that the better corrosion protection is only possible by improving the deposition of chromium, which is usually covered by a very thin, passive oxide film, Because of this, chromium is stable under normal conditions for most atmospheric corrosion environments, but it is well known that common chromium is avoided during deposition