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Ability against acid rain attack as a stone consolidant - lines 1-10 The pH change vs the number of periodic spraying indicates, for the untreated sample, a reduced corrosion during time: can the authors give an explanation to this behaviour? Is it due to the formation of gypsum not completely dissolved in water which acts as "passivity surface"? However the pH trend of Fig.7 does not seem to reach the stability after 7 periodic sprayings: low but constant is in fact observed. Explain and justify this trend. The trend of Calcium concentration (Fig.8) is "almost" in accordance with the pH values: this accordance is more evident for the first periodic sprayings than for the last ones. Probably this is due to the dissolution of gypsum formed during the previous sprayings without attack of new carbonate substrate. Introduce the explanation of this behaviour. |
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鐵桿木蟲(chóng) (著名寫(xiě)手)
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【答案】應(yīng)助回帖
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愛(ài)與雨下(金幣+1): 感謝應(yīng)助，歡迎常來(lái)！ 2011-09-02 11:59:58
xufeigao(金幣+10, 翻譯EPI+1): 6 2011-09-02 12:53:29
愛(ài)與雨下(金幣+1): 感謝應(yīng)助，歡迎常來(lái)！ 2011-09-02 11:59:58
xufeigao(金幣+10, 翻譯EPI+1): 6 2011-09-02 12:53:29
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作為加固石頭抵抗酸雨的能力，1-10行 噴涂周期對(duì)比pH的變化，對(duì)于未處理的樣本，在這期間內(nèi)顯示出腐蝕降低：作者是否能對(duì)此給出解釋？這是否是由于石膏未能完全溶解在水中表現(xiàn)出的被動(dòng)型表面？但是，圖7中pH的變化趨勢(shì)看起來(lái)并沒(méi)有在7個(gè)周期的噴涂后達(dá)到穩(wěn)定：實(shí)際上觀測(cè)到低但是恒定。解釋并且這名此趨勢(shì)。 鈣濃度的變化幾乎和pH的變化一致，此一致性在第一周期的噴涂中比最后一個(gè)周期噴涂更一致�？赡苓@是由于在上一個(gè)周期的噴涂中石膏分解未能抵抗新的碳酸鹽進(jìn)攻造成的。對(duì)此給出解釋？ |
2樓2011-09-02 11:59:06
3樓2011-09-02 12:08:34
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