Laboratory of Microbiology, Institute of Biology, University of Neuchâtel, 2000, Neuchâtel, Switzerland.
Laboratory of Technologies for Heritage Materials, Institute of Chemistry, University of Neuchâtel, 2000, Neuchâtel, Switzerland.
Sci Rep. 2018 Jan 15;8(1):764. doi: 10.1038/s41598-017-19020-3.
Exploiting bacterial metabolism for the stabilisation of corroded iron artefacts is a promising alternative to conventional conservation-restoration methods. Bacterial iron reduction coupled to biogenic mineral formation has been shown to promote the conversion of reactive into stable corrosion products that are integrated into the natural corrosion layer of the object. However, in order to stabilise iron corrosion, the formation of specific biogenic minerals is essential. In this study, we used the facultative anaerobe Shewanella loihica for the production of stable biogenic iron minerals under controlled chemical conditions. The biogenic formation of crystalline iron phosphates was observed after iron reduction in a solution containing Fe(III) citrate. When the same biological treatment was applied on corroded iron plates, a layer composed of iron phosphates and iron carbonates was formed. Surface and cross-section analyses demonstrated that these two stable corrosion products replaced 81% of the reactive corrosion layer after two weeks of treatment. Such results demonstrate the potential of a biological treatment in the development of a stabilisation method to preserve corroded iron objects.
利用细菌代谢来稳定腐蚀的铁制品是一种有前途的替代传统保护修复方法的方法。细菌铁还原与生物矿化的结合已被证明可以促进将反应性物质转化为稳定的腐蚀产物，这些产物被整合到物体的自然腐蚀层中。然而，为了稳定铁的腐蚀，形成特定的生物矿化物质是必不可少的。在这项研究中，我们使用兼性厌氧菌希瓦氏菌（Shewanella loihica）在受控化学条件下生产稳定的生物铁矿物质。在含有 Fe(III) 柠檬酸盐的溶液中进行铁还原后，观察到结晶态的铁磷酸盐的生物形成。当将相同的生物处理应用于腐蚀的铁板时，形成了由铁磷酸盐和铁碳酸盐组成的层。表面和横截面分析表明，经过两周的处理，这两种稳定的腐蚀产物取代了 81%的活性腐蚀层。这些结果表明，生物处理在开发稳定腐蚀铁制品的方法方面具有潜力。
