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随着发动机高负荷、高性能的发展,对气门材质提出了更高的要求。为了强化气门的使用性能,有些发动机的进气门改用:耐热不锈钢（4Cr9Si2或4Cr10Si2Mo）。而排气门选用奥氏体不锈钢（5Cr21MngNi4N）简称21—4N钢。气门材质的变更,使杆部“强化”的问题随之而来。 强化处理有各种不同的途径,而杆部镀铬是一种很好的强化处理方式。4Cr9Si2、4Cr10Si2Mo、21—4N等均属不锈钢,不锈钢表面有一层钝化膜,这主要是不锈钢中有含量较高的Cr元素和Ni元素的结果。由于钝化膜的保护作用,使得不锈钢表面镀铬产生一定的困难。国内外有关不锈钢镀铬的资料介绍,富铬、镍不锈钢不能直接镀铬,需作适当处理。
With the engine high-load, high-performance development, the valve material put forward higher requirements. In order to enhance the valve performance, some engine intake valve switch to: heat-resistant stainless steel (4Cr9Si2 or 4Cr10Si2Mo). The exhaust valve selection of austenitic stainless steel (5Cr21MngNi4N) referred to as 21-4N steel. Valve material changes, so that the club “to strengthen” the question ensues. There are a variety of ways to reinforce, and the chrome on the shank is a good way to reinforce it. 4Cr9Si2, 4Cr10Si2Mo, 21-4N, etc. are stainless steel, stainless steel surface with a layer of passive film, which is mainly the content of stainless steel Cr elements and Ni results. Due to the protective effect of passivation film, chrome plating on the surface of stainless steel has some difficulties. Domestic and international information on stainless steel chrome, chromium-rich, nickel stainless steel can not be directly chrome, need to be properly handled.