原子能科学技术
原子能科學技術
원자능과학기술
ATOMIC ENERGY SCIENCE AND TECHNOLOGY
2014年
3期
416-421
,共6页
马姝丽%罗英%张强%王浩%邱绍宇
馬姝麗%囉英%張彊%王浩%邱紹宇
마주려%라영%장강%왕호%구소우
不锈钢%超临界水%腐蚀行为%氧化膜
不鏽鋼%超臨界水%腐蝕行為%氧化膜
불수강%초림계수%부식행위%양화막
stainless steel%supercritical water%corrosion behavior%oxide film
研究了3种候选材料(347、H R3C和In-718)在650℃、25 M Pa去离子水中的均匀腐蚀行为,使用场发射扫描电镜(FEG-SEM )和能谱(EDS)观察了不同腐蚀时间的表面氧化膜形貌与合金元素分布,使用掠入射X射线衍射(G IX RD )分析了氧化膜相结构。结果表明,3种材料腐蚀失重均符合抛物线规律,347的失重为 HR3C和In-718的40倍以上;3种材料氧化膜均以 Ni(Cr ,Fe)2 O4为主,In-718点蚀严重,347氧化膜明显脱落,H R3C氧化膜较均匀致密;高温超临界水中,提高合金的C r含量有助于增强均匀腐蚀性能,添加Nb有损合金的点蚀抗力。
研究瞭3種候選材料(347、H R3C和In-718)在650℃、25 M Pa去離子水中的均勻腐蝕行為,使用場髮射掃描電鏡(FEG-SEM )和能譜(EDS)觀察瞭不同腐蝕時間的錶麵氧化膜形貌與閤金元素分佈,使用掠入射X射線衍射(G IX RD )分析瞭氧化膜相結構。結果錶明,3種材料腐蝕失重均符閤拋物線規律,347的失重為 HR3C和In-718的40倍以上;3種材料氧化膜均以 Ni(Cr ,Fe)2 O4為主,In-718點蝕嚴重,347氧化膜明顯脫落,H R3C氧化膜較均勻緻密;高溫超臨界水中,提高閤金的C r含量有助于增彊均勻腐蝕性能,添加Nb有損閤金的點蝕抗力。
연구료3충후선재료(347、H R3C화In-718)재650℃、25 M Pa거리자수중적균균부식행위,사용장발사소묘전경(FEG-SEM )화능보(EDS)관찰료불동부식시간적표면양화막형모여합금원소분포,사용략입사X사선연사(G IX RD )분석료양화막상결구。결과표명,3충재료부식실중균부합포물선규률,347적실중위 HR3C화In-718적40배이상;3충재료양화막균이 Ni(Cr ,Fe)2 O4위주,In-718점식엄중,347양화막명현탈락,H R3C양화막교균균치밀;고온초림계수중,제고합금적C r함량유조우증강균균부식성능,첨가Nb유손합금적점식항력。
The general corrosion behavior of three candidate materials (347 ,HR3C and In-718 ) was investigated in 650 ℃ /25 MPa deionized water . Morphology and composition of the surface oxide film with different exposure time were observed through FEG-SEM and EDS .The phase constitute was analyzed by GIXRD .For all the test materials ,the weight loss follows typical parabolic law and the weight loss of 347 shows more than 40 times higher than that of HR3C and In-718 .The oxide film of three alloys mainly consists of Ni(Cr, Fe)2O4 .In-718 shows severe pitting and the oxide film of 347 appears significant spalling ,while HR3C has compact oxide film .In the high temperature supercritical water ,the high Cr content may enhance the general corrosion property of the alloys ,while addition of Nb may be detrimental to the pitting resistance of alloys .