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不锈钢方管性能分析

网址:www.buxiugangw.cn  2019-03-20  作者:admin    阅读:

金属在大气中都可与氧气反应在表面形成氧化膜,普通碳钢上形成的氧化铁会继续进行氧化,使锈蚀不断扩大,最终形成孔洞。这可以利用油漆或耐氧化的金属进行电镀来保护碳钢表面,但这种保护层只是一种薄膜,如果保护层被破坏,下面的钢便又开始锈蚀。不锈钢管是否被锈蚀与钢中的铬含量有关,钢中的铬含量达到12%时,在大气中,不锈钢管表面生成了一层钝化的、致密的富铬氧化物而保护表面,可防止进一步再氧化。这种氧化层极薄,透过它可以看到钢表面的自然光泽,使不锈钢具有独特的表面。如果铬膜一旦破坏,钢中的铬与大气中的氧重新生成钝化膜,继续起保护作用。在一些特殊环境下,不锈钢也会出现某些局部腐蚀而失效,但不锈钢与碳钢不同,不会出现均匀腐蚀而失效,因此腐蚀余量对不锈钢管来说没有意义。

Metals can react with oxygen in the atmosphere to form oxide film on the surface. Iron oxide formed on common carbon steel will continue to oxidize, which will expand the corrosion and eventually form holes. This can be done by electroplating paints or oxidizing-resistant metals to protect the surface of carbon steel, but the protective layer is only a thin film. If the protective layer is damaged, the steel www.zhutiezhamen.net.cnwww.buxiugangwanguan.cnwww.penwuganzaojii.cnwww.gangchensu.cn

www.chenban.net.cnwww.taocichenban.cnbelow begins to rust again. Whether the stainless steel pipe is corroded or not depends on the chromium content in the steel. When the chromium content in the steel reaches 12%, a passive and dense chromium-rich oxide is formed on the surface of the stainless steel pipe to protect the surface, which can prevent further oxidation. This kind of oxide layer is very thin, through which the natural luster of steel surface can be seen, so that stainless steel has a unique surface. If the chromium film is destroyed, the chromium in the steel and oxygen in the atmosphere will regenerate the passive film and continue to play a protective role. In some special circumstances, stainless steel will also appear some local corrosion and failure, but unlike carbon steel, stainless steel will not appear uniform corrosion and failure, so the corrosion margin for stainless steel pipes is meaningless.

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