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81.
Effect of trace rare earth element Er on high pure Al 总被引:21,自引:0,他引:21
1 INTRODUCTIONAsit swellknown ,Chinaisrichinrareearths ,whoseprovedreservesare 80 %ofthetotalreservesoftheworld ,rankingfirstintheworld .Atpresent,theresearchandapplicationofREinsteel&ironareratherprofoundinChina .ThoughtheapplicationandstudiesaboutREinaluminumanditsalloysbeganearly ,it snotuntillateinthe 1970 sthattheinvesti gationandexploitationbeganonalargescaleandgraduallycametoaclimax[13] .Inthepast ,there searchofREaluminummainlyfocusedontheapplica tionofsomeelementssuchasLa ,… 相似文献
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The self-assembled monolayers (SAMs) of a series of substituted benzenethiol (BT) molecules, X-C6H4-SH (where X = meta-NH2, ortho-NH2, para-NH2, para-NHCOCH3, para-F, para-CH3 and para-CH(CH3)2), have been prepared by adsorption from a solution onto a fresh copper (Cu) surface pretreated by a nitric acid etch. The corrosion inhibition efficiency of the modified Cu surfaces in a sulfuric acid solution was investigated by electrochemical characterization. The protection afforded by the substituted functional groups on BT is strongly influenced by the type and the position of the substituent on the benzene ring. BT molecules without any substituent group on the ring are ineffective corrosion inhibitors, indicating that the chemical configuration is the key factor in determining the efficacy of the SAMs as barriers to electrochemically corrosive ions. It is further proposed that the steric hindrance offered by the substituted group in the SAMs plays a very important role in determining its barrier properties. 相似文献
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Sulfidation behavior of Fe-25Cr-20Ni-1.5Al2O3 in simulated coal combustion/gasification environments
The effect of minor addition of -Al2O3 dispersoids on the sulfidation behavior of Fe-25Cr-20Ni was investigated over a range of pO2, 1.13×10–20 to 1.18×10 ****–22 atm. at constant pS2=1.22×10–8 atm. Fe-25Cr-20Ni and Fe-25Cr-20Ni 1.5 Al2O3 with and without preformed oxide scales were exposed to bioxidant gas mixtures H2/H2O/H2S/Ar at 700° C. Both isothermal and cyclic exposures were included. Scales were characterized by a combination of several surface analytical tools. A remarkable improvement in sulfidation resistance is observed in Fe-25Cr-20Ni-1.5Al2O3 under the conditions investigated here. This is attributed to the ability of the alloy to form and maintain a predominantly Cr2O3 scale with reduced Fe-diffusion and content. Possible scientific reasons for such improvement are discussed. The base alloy, Fe-25Cr-20Ni, fails to develop and retain such a Cr2O3 scale and undergoes sulfidation within a few minutes of exposure. The scale breakdown process by sulfidation is explained qualitatively. Experimental evidence suggests that sulfur in the environment enhances Fe-diffusion and content in the scale. 相似文献
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