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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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xiaoqihu
铁杆木虫 (著名写手)
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【答案】应助回帖
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爱与雨下(金币+1): 感谢应助，欢迎常来！ 2011-09-02 11:59:58
xufeigao(金币+10, 翻译EPI+1): 6 2011-09-02 12:53:29
爱与雨下(金币+1): 感谢应助，欢迎常来！ 2011-09-02 11:59:58
xufeigao(金币+10, 翻译EPI+1): 6 2011-09-02 12:53:29
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作为加固石头抵抗酸雨的能力，1-10行 喷涂周期对比pH的变化，对于未处理的样本，在这期间内显示出腐蚀降低：作者是否能对此给出解释？这是否是由于石膏未能完全溶解在水中表现出的被动型表面？但是，图7中pH的变化趋势看起来并没有在7个周期的喷涂后达到稳定：实际上观测到低但是恒定。解释并且这名此趋势。 钙浓度的变化几乎和pH的变化一致，此一致性在第一周期的喷涂中比最后一个周期喷涂更一致。可能这是由于在上一个周期的喷涂中石膏分解未能抵抗新的碳酸盐进攻造成的。对此给出解释？ |
2楼2011-09-02 11:59:06
3楼2011-09-02 12:08:34
