采用XRD,SEM和EMPA等分析方法研究了表面喷涂碱金属硫酸盐的Super304H在750℃空气中的耐高温腐蚀特性.结果表明:Super304H在腐蚀初期发生高温氧化,动力学曲线遵循抛物线规律,表面生成相对致密且具有保护性作用的铁/铬氧化膜;延长腐蚀时间,生成挥发性腐蚀产物Na4 (CrO4)(SO4);氧化膜增厚,变得疏松多孔,近基体表面处细小孔隙萌生,并聚集长大成微裂纹、微孔洞,基体内部发生内硫化.分析认为:低熔点共晶体Na2O·Na2 SO4的形成以及Cr2O3在硫酸盐中的碱性熔融促进了腐蚀加速与持续.
参考文献
| [1] | 林富生,王治政,王宝忠,程世长,谢锡善.中国电站用耐热钢及合金的研制、应用与发展[J].动力工程学报,2010(04):235-244. |
| [2] | R. Viswanathan;J.F. Henry;J. Tanzosh .U.S. Program on Materials Technology for Ultra-Supercritical Coal Power Plants[J].Journal of Materials Engineering and Performance,2005(3):281-292. |
| [3] | 张知翔,成丁南,边宝,金用强,徐良红,赵钦新.水冷壁材料在模拟烟气中的高温腐蚀研究[J].材料工程,2011(04):14-19. |
| [4] | P. Castello;V. Guttmann;N. Farr;G. Smith .Laboratory-simulated fuel-ash corrosion of superheater tubes in coal-fired ultra-supercritical-boilers[J].Materials and Corrosion,2000(11):786-790. |
| [5] | GAYLORD D S;HOWARD W S.Introduction of an advanced superheater alloy for coal-fired boilers[A].Houston:NACE International,2000:256. |
| [6] | 谢锡善,赵双群,董建新,张麦仓.超超临界电站用Inconel 740镍基合金的组织稳定性及其改型研究[J].动力工程学报,2011(08):638-643. |
| [7] | Gosia Stein-Brzozowska;Diana M. Florez;Joerg Maier;Guenter Scheffknecht .Nickel-base superalloys for ultra-supercritical coal-fired power plants: Fireside corrosion. Laboratory studies and power plant exposures[J].Fuel,2013(Jun.):521-533. |
| [8] | 张林伟,王鲁,王全胜,宁先进.真空预氧化对冷喷涂CoNiCrAlY涂层组织及热腐蚀性能的影响[J].材料工程,2013(04):12-16. |
| [9] | 王俪篥,朱丽慧,王起江.Super304H耐热钢的强化机理[J].材料热处理学报,2011(06):127-131. |
| [10] | ISEDA A;OKADA H;SEMBA H et al.Long term creep properties and microstructure of SUPER304H,TP347HFG and HR3C for A-USC boilers[J].Energy Materials:Materials Science and Engineering for Energy Systems,2007,2(4):199-206. |
| [11] | VISWANATHAN R;SARVER J;TANZOSH J M et al.Boiler materials for ultra-supercritical coal power plants-steamside oxidation[J].Journal of Materials Engineering and Performance,2006,15(3):255-274. |
| [12] | 周一工.我国动力用煤特点和燃煤电站锅炉环保措施[J].上海电机学院学报,2007(01):13-19,29. |
| [13] | LIANGQUAN SHI .ON THE POSSIBILITY OF A Na_2SO_4-Na_2O EUTECTIC MELT DEVELOPING ON METALS COATED WITH Na_2SO_4 DEPOSIT IN OXYGEN/AIR AT INTERMEDIATE TEMPERATURES[J].Corrosion Science,1995(8):1281-1287. |
| [14] | FRYBURG G C;KOHL F L;STEARNS C A .Chemical reactions involved in the initiation nf hot corrosion of IN-738[J].Journal of the Electrochemical Society,1984,131(12):2985-2997. |
| [15] | 包新华 .熔盐相图智能数据库研究及其应用[D].上海大学,2005. |
| [16] | Pavleta Knutsson;Haiping Lai;Krystyna Stiller .A method for investigation of hot corrosion by gaseous Na_2SO_4[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2013(Aug.):230-236. |
| [17] | FANG W C;RAPP R A .Electrochemical reactions in a pure Na2SO4 melt[J].Journal of the Electrochemical Society,1983,130(12):2335-2341. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%