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研究论文

2205双相不锈钢沉积氯化钠之高温腐蚀

  • 彭富福 ,
  • 王朝正 ,
  • 林裕章
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  • 台湾科技大学机械工程研究所,台湾科技大学机械工程研究所,台湾科技大学机械工程研究所 台北台湾,台北台湾,台北台湾

收稿日期: 2005-11-28

  修回日期: 2005-11-28

  网络出版日期: 2005-11-28

The High Temperature Corrosion of 2205 Duplex Stainless Steel with NaCl Deposit

  • PENG Fu-fu ,
  • WANG Chaur-jeng~ ,
  • LIN Yu-chang
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  • (Department of Mechanical Engineering,National Taiwan University ofScience and Technology,Taipei,Taiwen,China

Received date: 2005-11-28

  Revised date: 2005-11-28

  Online published: 2005-11-28

摘要

本文研究表面沉积2 mg/cm2氯化钠的2205双相不锈钢(2205 DSS)在500 vppm NaC(l g)流动气氛加热炉内550~850℃下之高温腐蚀.结果显示,2205 DSS之高温腐蚀动力学遵守)物线定律,腐蚀反应速率随温度的上升而加速.高温腐蚀后生成的腐蚀皮膜结构由外而内依次为Fe2O3、Fe3O4、Cr2O3及FeCr2O4,不同温度下腐蚀生成的皮膜结构并无明显相异,唯850℃之试片于氧化皮膜脱落后,从其表层较容易检测到S iO2及N iO.在双相结构腐蚀顺序实验中,对表面沉积2 mg/cm2氯化钠的试片,其腐蚀顺序与α、γ相无关,为全面性的腐蚀.但于500 vppm NaC l(g)的流动气氛下,虽无法分辨α、γ相的腐蚀顺序,但可发现γ相较α相有较快速腐蚀的现象.

本文引用格式

彭富福 , 王朝正 , 林裕章 . 2205双相不锈钢沉积氯化钠之高温腐蚀[J]. 电化学, 2005 , 11(4) : 369 -376 . DOI: 10.61558/2993-074X.1670

Abstract

The objective of this study was to figure out the hot corrosion behavior of 2205 duplex stainless steel(2205 DSS) within the temperature ranges from 550 to 850℃ in the static air condition with 2 mg/cm~(2)NaCl deposit,and in the air atmosphere condition with a constant flow rate of 500 vppm NaCl_((g)),respectively.Experimental results show that the hot corrosion kinetics met the parabolic rate law and the corrosion rate increased constantly with increasing temperature.The scales formed included Fe_(2)O_(3)/Fe_(3)O_(4)/Cr_(2)O_(3) and FeCr_(2)O_(4)from outer layer to inner layer.The sequence of formation is independent of the environment temperature,but the SiO_2 and NiO can be found in the substrate of 850℃specimen.The corrosion sequence in two phase structure of 2205 DSS was not influenced by α and γ phases in the 2 mg/cm~(2)NaCl deposit due to complete corrsion and in the air atmospheres condition with a constant flow rate of 500 vppm NaCl_((g)).In the case of constant flow rate of 500 vppm NaCl_((g)),the corrosion rate in the γ phase was greater than that in the α phase,although the corrosion sequence was not known.

参考文献

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