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CORROSION BEHAVIOR OF A NEW NICKEL BASE ALLOY IN SUPERCRITICAL WATER CONTAINING DIVERSE IONS
Ou Meiqiong1,2; Liu Yang3; Zha Xiangdong1; Ma Yingche1,4; Cheng Leming3; Liu Kui1
Corresponding AuthorMa Yingche(ycnia@imr.ac.cn)
2016-12-12
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:12Pages:1557-1564
AbstractThe productivity of municipal sewage sludge is difficult to treat by traditional methods. Supercritical water oxidation (SCWO) is an attractive municipal sewage sludge treatment technology. However, the process of SCWO must be carried out in a reactor which will resist not only high temperature (above 374.15 degrees C) and high pressure (above 22.1 MPa) conditions but also a corrosive environment. Thus, the material used in the equipment is referred to be a key factor that restricts the application of the SCWO technology. Many materials have been selected for corrosion test under corrosive environments with SCWO, including austenitic stainless steel, nickel base alloys, titanium alloys and zirconium alloys. At present, in order to treat rich phosphorous sewage sludge, a new corrosion resistant nickel base alloy X-1# alloy has been developed to apply to the reactor of SCWO process. X-1# alloy has excellent corrosion-resistance and oxidation-resistance properties in supercritical water containing PO43-, Cl- and SO42-. The corrosion behaviors of X-1# alloy exposed to 550 degrees C, 23 MPa supercritical water containing PO43-, Cl- and SO42- were investigated in this research. The exposed time was 72, 159, 248, 429 and 537 h. Morphologies, microstructures and chemical composition of oxide films in X-1# alloy and deposit sediment in reaction were studied using grazing incidence XRD, XPS and SEM equipped with EDS. The XRD, EDS and XPS analysis of X-1# alloy was performed to identify the composition of oxide layers, which were identified as NiCr2O4, Cr2O3, NiO, Ni-3(PO4)(2), CrPO4 and Na3PO4. In addition, it was founded that continuous and uniform oxide films were formed in supercritical water. The oxide film was a duplex-layer structure, the loose outer layer was NiO, Ni(OH)(2) and phosphates, including Ni-3(PO4)(2), CrPO4 and Na3PO4, while the compact inner layer consisted of NiCr2O4 and Cr2O3. X-1# alloy showed a high corrosion rate in the initial stage and the corrosion rate decreased obviously after exposed to 248 h, the reason of which was that the compact inner layer of oxide films had good stability and benefited to the corrosion behavior of X-1# alloy. In order to explain the corrosion behavior of X-1# alloy, the oxide films growth mechanical, metal ions and oxygen ions dissolution mechanism and phosphates precipitation mechanism will be discussed in this research.
Keywordnickel base alloy supercritical water oxidation (SCWO) oxide film phosphate
DOI10.11900/0412.1961.2016.00113
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000391244600009
PublisherSCIENCE PRESS
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/123607
Collection中国科学院金属研究所
Corresponding AuthorMa Yingche
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
3.ENN Sci & Technol Dev Co Ltd, State Key Lab Coal Based Low Carbon Energy, Langfang, Peoples R China
4.Jiangsu Toland Alloy Co, Danyang 212352, Peoples R China
Recommended Citation
GB/T 7714
Ou Meiqiong,Liu Yang,Zha Xiangdong,et al. CORROSION BEHAVIOR OF A NEW NICKEL BASE ALLOY IN SUPERCRITICAL WATER CONTAINING DIVERSE IONS[J]. ACTA METALLURGICA SINICA,2016,52(12):1557-1564.
APA Ou Meiqiong,Liu Yang,Zha Xiangdong,Ma Yingche,Cheng Leming,&Liu Kui.(2016).CORROSION BEHAVIOR OF A NEW NICKEL BASE ALLOY IN SUPERCRITICAL WATER CONTAINING DIVERSE IONS.ACTA METALLURGICA SINICA,52(12),1557-1564.
MLA Ou Meiqiong,et al."CORROSION BEHAVIOR OF A NEW NICKEL BASE ALLOY IN SUPERCRITICAL WATER CONTAINING DIVERSE IONS".ACTA METALLURGICA SINICA 52.12(2016):1557-1564.
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