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寂寞傾城金蟲(chóng) (小有名氣)
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[求助]
英語(yǔ)翻譯，各位大神幫幫忙！
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標(biāo)題：Oxygen reduction mechanism on corroded zinc 摘要：The mechanism of oxygen reduction on the as-polished and corroded zinc specimens has been studied using a rotating ring disc electrode (RRDE) system. On the as-polished surface, oxygen was reduced into two distinct steps. In the first step, about 44% of O2 was reduced to H2O2 in a 2-electron reaction with the rest being reduced to OH in a 4-electron reaction. On the other hand, in the second step, with the increase of overpotential O2 was almost exclusively reduced to OH in a 4-electron reaction. The first step reduction occurred on an air-formed oxide-covered surface at more positive potential than 1.2 V vs. Ag/AgCl and the second step reduction (E < 1.2 V) took place on a semi-uniformly active surface. On the corroded surface, the second step was not distinctly observed on the polarization curve, because reduction of the zinc corrosion products simultaneously took place around 1.2 V. The O2 reduction in the first step was inhibited by deposition of the corrosion products, though the ratio of amount of O2 reduced to OH in a 4-electron reaction was larger than that on the as-polished surface. The mechanism of oxygen reduction is discussed on the basis of results obtained from the RRDE experiment. |
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xiaokaizi
金蟲(chóng) (著名寫(xiě)手)
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2樓2011-10-07 20:27:56
xiaokaizi
金蟲(chóng) (著名寫(xiě)手)
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3樓2011-10-07 20:29:11
nowchenchao
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愛(ài)與雨下(金幣+1): ~！ 2011-10-09 12:04:53
sltmac(金幣+5): 2011-10-15 08:35:48
sltmac(金幣+5): 2011-10-15 08:35:51
sltmac: 辛苦，歡迎常來(lái) 2011-10-15 08:35:58
愛(ài)與雨下(金幣+1): ~！ 2011-10-09 12:04:53
sltmac(金幣+5): 2011-10-15 08:35:48
sltmac(金幣+5): 2011-10-15 08:35:51
sltmac: 辛苦，歡迎常來(lái) 2011-10-15 08:35:58
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標(biāo)題：鋅腐蝕氧化還原機(jī)理 摘要：對(duì)于拋光和腐蝕鋅標(biāo)本的氧化還原機(jī)理，我們使用旋轉(zhuǎn)環(huán)盤(pán)電極（RRDE）系統(tǒng)對(duì)其進(jìn)行了研究。在拋光的表面，氧氣還原分為兩個(gè)不同的步驟。在第一步中，約44％的O2被還原成H2O2在一個(gè)2-電子的反應(yīng)中，而剩余的氧則被還原成 OH 在一個(gè)4電子的反應(yīng)中。另一方面，在第二步當(dāng)中，隨著氧氣點(diǎn)位的增高，幾乎所有的氧在一個(gè)4電子的反應(yīng)中被還原成為OH。第一步還原反應(yīng)在鋅周?chē)諝庑纬梢粋�(gè)氧氣覆蓋面與在（1.2 V與銀/氯化銀）的情況下相比反應(yīng)更為完全，而第二步的還原反應(yīng)（E <1.2 V），則發(fā)生在一個(gè)半均勻活躍的表面。在銹蝕的表面，第二步是不易在 極化曲線上觀察到的，因?yàn)殇\腐蝕產(chǎn)物的還原同時(shí)也發(fā)生在大約1.2 V左右。而第一步中的氧化還原受到了腐蝕產(chǎn)物沉積的抑制，雖然這時(shí)氧氣在4電子反應(yīng)直播中被還原成OH的比例大于拋光表面的氧氣被還原的比例。氧還原反應(yīng)的機(jī)制的討論是在RRDE實(shí)驗(yàn)得到的結(jié)果的基礎(chǔ)展開(kāi)的。 |
4樓2011-10-09 09:52:45
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