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首页> 外文期刊>ISIJ international >Accelerated corrosion behavior due to alternating dry-wet conditions for LP steam turbine materials of fossil power plants
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Accelerated corrosion behavior due to alternating dry-wet conditions for LP steam turbine materials of fossil power plants

机译：化石电厂低压蒸汽轮机材料的交替干湿条件导致的加速腐蚀行为

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摘要

The materials of the attachment near the last stage of low-pressure steam turbines in power plants will be exposed to a severe corrosion condition due to the concentration of corrosive chemicals produced by the alternating dry and wet environment, a phenomenon caused by the frequent shutdown and the load change of power plants. The corrosion behavior of typical low-pressure steam turbine materials is evaluated mainly by tests under dry-wet conditions. An increase in the concentration of sulfate ion and chloride ion in waters enhanced the general corrosion particularly for the 3.5NiCrMoV rotor steel. As for 12Cr blade steel, the coexistence of sulfate ion and chloride ion accelerated the general corrosion. An alternating dry-wet condition increased the maximum corrosion pit depth of 3.5NiCrMoV steel remarkably with the application of stress. The pitting corrosion potential of 3.5NiCrMoV steel showed almost the same values in all water qualities tested. However, the coexistence of Cl~ and DO (dissolved oxygen) lowered the pitting corrosion potentials of 12Cr steel. From the consideration between the corrosion and the Cr content in corrosion films, it is clearly evident that the Cr content in the films controls the corrosion resistance.
机译：发电厂低压蒸汽轮机最后一级附近的附件材料将受到严峻的腐蚀条件，这是由于干湿交替的环境中产生的腐蚀性化学物质的浓度高，这种现象是频繁停机和发电厂的负荷变化。典型的低压蒸汽轮机材料的腐蚀行为主要通过在干湿条件下的测试来评估。水中硫酸根离子和氯离子浓度的增加增强了一般腐蚀，特别是对于3.5NiCrMoV转子钢。对于12Cr叶片钢，硫酸根离子和氯离子的共存加速了整体腐蚀。交替的干湿条件通过施加应力显着增加了3.5NiCrMoV钢的最大腐蚀坑深度。在所有测试的水质中，3.5NiCrMoV钢的点腐蚀电位显示几乎相同的值。然而，Cl〜和DO（溶解氧）的共存降低了12Cr钢的点蚀电位。从腐蚀与腐蚀膜中的Cr含量之间的考虑出发，显然可以看出，膜中的Cr含量控制着耐蚀性。

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