Studies of lead corrosion in acetic acid environments
Studies of lead corrosion in acetic acid environments
复制标题
醋酸环境中铅腐蚀的研究
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Eugénie Stamatopoulou
中科院分区：
文献类型：
--
作者：
Jean Tétreault;P. Sirois;Eugénie Stamatopoulou
摘要许多铅制文物在含有释放羧酸的材料的外壳中保存较短时间后就会受到损坏。在改变暴露时间、乙酸（乙酸）浓度和相对湿度（RH）的实验条件下，研究了腐蚀产物的形成和铅的腐蚀敏感性。在 54% RH 下，在研究的乙酸浓度范围内，重量增加最大，约为 4mgm−3。在 12 个月的时间里，当相对湿度低于 75% 时，在乙酸浓度低于 0·43mgm−3 的情况下，铅样品未检测到任何损坏。然而，铅的成分和形态的变化以及外壳中其他羰基化合物的存在可能会影响腐蚀速率。由于这些原因，建议低分子量羰基化合物的总浓度不高于0·1mgm−3。提出了将羰基化合物的浓度维持在 0·1mgm−3 以下的策略。
AbstractMany lead artifacts are danzaged after being kept for a short period in enclosures that contain materials which emit carboxylic acids. The formation of corrosion products and the corrosion sensitivity of lead were studied under experimental conditions in which the duration of exposure, the acetic acid (ethanoic acid) concentration and the relative humidity (RH) were varied. At 54% RH, in the acetic acid concentration range studied, weight gain was maximun at around 4mgm−3. Over a period of 12 months, with RH levels below 75%, no damage was detected on lead samples at acetic acid concentrations below 0·43mgm−3. However, variations in the composition and morphology of lead as well as the presence of other carbonyl compounds in enclosures may affect the rate of corrosion. For these reasons, a total concentration of low molecular weight carbonyl compounds no higher than 0·1mgm−3 is recommended. Strategies to maintain the concentration of carbonyl compounds below 0·1mgm−3 are proposed.