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影响球墨铸铁井盖耐腐蚀功能的因素?

来源:http://www.kpp647.com添加时间:2020-04-03 13:38:53

山东球墨铸铁井盖进程由熔炼、浇注及热处理三部分组成。本文别离讨论各工序对球墨铸铁耐腐蚀功能的影响。

  The well cover process of Shandong nodular cast iron consists of melting, pouring and heat treatment. This paper discusses the influence of each process on the corrosion resistance of nodular cast iron.

  1影响球墨铸铁井盖耐腐蚀功能的要素

  1 factors affecting the corrosion resistance of ductile iron manhole cover

  球墨铸铁的熔炼工艺是影响球墨铸铁井盖耐腐蚀功能的重要要素。因为熔炼工艺直接决议了钢液的纯净程度,从而较终决议了井盖的内在质量和井盖成分。熔炼进程中较重要的是脱碳保铬,其次是尽可能脱出钢液中的非金属夹杂物。

  The melting process of nodular cast iron is an important factor that affects the corrosion resistance of nodular cast iron manhole cover. Because the smelting process directly determines the purity of the molten steel, which ultimately determines the internal quality and composition of the well cover. In the smelting process, decarburization and chromium retention are more important, followed by the removal of non-metallic inclusions in the molten steel as much as possible.

  铬是耐腐蚀元素,铬的氧化物在球墨铸铁外表构成一层钝化膜,阻止了球墨铸铁的进一步氧化,才使球墨铸铁具有耐腐蚀功能。球墨铸铁中的铬含量低于12时,会使球墨铸铁耐腐蚀功能显着下降。

山东球墨铸铁井盖

  Chromium is a corrosion-resistant element. The oxide of chromium forms a passive film on the surface of nodular cast iron, which prevents the further oxidation of nodular cast iron, so that nodular cast iron has corrosion-resistant function. When the chromium content in the nodular cast iron is lower than 12, the corrosion resistance of the nodular cast iron will decrease significantly.

  而碳含量直接和钢的耐腐蚀功能密切相关。碳的存在使球墨铸铁在焊接或在约510~788℃加热时容易发生晶界贫铬现象,导致晶间腐蚀。因而球墨铸铁耐蚀功能遭到钢中含碳量的强烈影响。低碳(≤0.08%C)和超低碳(≤0.03%C堪至于高纯(≤0.015%C)球墨铸铁是现代球墨铸铁的发展方向。

  The carbon content is directly related to the corrosion resistance of steel。 The existence of carbon makes the nodular cast iron prone to intergranular corrosion when it is welded or heated at about 510-788 ℃。 Therefore, the corrosion resistance of nodular cast iron is strongly affected by the carbon content in the steel。 The development direction of modern nodular cast iron is that low carbon (< 0。08% C) and ultra-low carbon (< 0。03% C) can be regarded as high-purity (< 0。015% C)。

  非金属夹杂物数量与分布对球墨铸铁的耐腐蚀功能也有重要影响。杂质的存在可能使球墨铸铁成分不均匀,使球墨铸铁外表的电极电位不一致,导致电化学腐蚀。因而下降球墨铸铁井盖中的杂质也能添加球墨铸铁的耐腐蚀功能。

  The amount and distribution of nonmetallic inclusions also have an important influence on the corrosion resistance of nodular cast iron. The existence of impurities may make the composition of nodular cast iron uneven, make the electrode potential on the surface of nodular cast iron inconsistent, and lead to electrochemical corrosion. Therefore, reducing the impurities in the manhole cover of nodular cast iron can also add the corrosion resistance function of nodular cast iron.

  以上就是对影响球墨铸铁井盖耐腐蚀功能的因素的详细介绍,想要了解更多请点击官网http://www。jnwszy。com

  The above is a detailed introduction to the factors affecting the corrosion resistance of ductile iron manhole covers。 For more information, please click http://www。jnwszy。com



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