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首页> 外文期刊>Journal of the Brazilian Chemical Society >Metal corrosion in polychrome baroque lead sculptures: A case study
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Metal corrosion in polychrome baroque lead sculptures: A case study

机译：彩色巴洛克式铅雕塑中的金属腐蚀：案例研究

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摘要

Polychrome lead sculptures from Oratory Museum in Ouro Preto (Minas Gerais, Brazil) kept inside a glass showcase were severely degraded. The formed corrosion products were analyzed by X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray fluorescence (EDX) and Raman microscopy and proved to be mostly Pb carbonates and formates. Although carbonate is a very common finding in Pb atmospheric corrosion, Pb formates can be formed by the action of formic acid or formaldehyde, being their origin a key point to be investigated. Environmental simulations with Pb coupons exposed to possible sources of these volatile organic compounds led to the conclusion that the degradation process was caused mainly by the curing process of the painted showcase baseplate. However, cleaning products, which can also contain formaldehyde as preservative, proved to be potentially harmful to Pb, accelerating its corrosion.
机译：放在玻璃陈列柜中的欧鲁普雷图（Ouro Preto）演说博物馆（Oratory Museum）的彩铅雕塑严重退化。通过X射线衍射（XRD），傅里叶变换红外光谱（FTIR），扫描电子显微镜（SEM），能量色散X射线荧光（EDX）和拉曼显微镜对形成的腐蚀产物进行了分析，事实证明主要是碳酸盐和碳酸铅。格式化。尽管碳酸盐是在Pb大气腐蚀中非常普遍的发现，但是Pb甲酸盐可以通过甲酸或甲醛的作用形成，这是它们的起源，是要研究的关键点。通过将Pb试样暴露于这些挥发性有机化合物的可能来源进行的环境模拟得出的结论是，降解过程主要是由涂漆的橱柜基板的固化过程引起的。但是，事实证明，清洁产品还可能含有甲醛作为防腐剂，可能对Pb有害，从而加速其腐蚀。

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