土木与环境工程学报（中英文）2026，Vol.48Issue(2)：30-39,10.DOI:10.11835/j.issn.2096-6717.2025.110
两株优势霉菌对大足千手观音金箔腐蚀的作用机制
Mechanism of gold foil corrosion by two dominant fungal strains on the Dazu Thousand-handed and Thousand-eyed Avalokitesvara
摘要
Abstract
In recent years,partial deterioration of the gilded layer on the Dazu Thousand-handed and Thousand-eyed Avalokitesvara has posed a serious threat to the preservation of this cultural heritage.In this study,Asper-gillus versicolor and Mucor fragilis,previously isolated from the gold foil surface,were selected as model organisms.Laboratory-simulated conditions were employed to investigate their corrosive effects on the gold foil.Corrosion behavior was monitored through pH,open circuit potential,electrochemical impedance spectrosco-py,and polarization curves.Additionally,transmission electron microscopy(TEM)and energy-dispersive X-ray spectroscopy(EDS)were utilized to characterize morphological and elemental changes.The results demonstrat-ed that both fungal strains significantly accelerated gold foil corrosion.A marked decrease in surface gold(Au)content was observed,accompanied by the enrichment of carbon(C),oxygen(O),and sulfur(S)elements.Elec-trochemical analyses revealed a negative shift in corrosion potential by 0.20-0.24 V,a nearly tenfold increase in corrosion current density,and corrosion efficiencies of 91.38% and 88.91% for Aspergillus versicolor and Mucor fragilis,respectively.The preliminary mechanistic inferences suggest that organic acids(e.g.,citric acid and oxalic acid)produced by fungal metabolism rapidly reduced the local pH to 4.5-4.8,thereby disrupting the passive layer.Moreover,extracellular polymeric substances(EPS)secreted by the fungi facilitated biofilm for-mation and likely enhanced interfacial reactions through sulfide adsorption.The flake corrosion patterns induced by Aspergillus versicolor were attributed to the increased electrolyte penetration promoted by its hydrophilic polysaccharide-rich biofilm.Conversely,the crack propagation caused by Mucor fragilis was possibly driven by micro-galvanic effects associated with its saccharification products.关键词
千手观音/金箔腐蚀/杂色曲霉菌/易脆毛霉菌/腐蚀机制Key words
Thousand-handed and Thousand-eyed Avalokitesvara/gold foil corrosion/Aspergillus versicolor/Mucor fragilis/corrosion mechanism分类
建筑与水利引用本文复制引用
杨豪,贺嫱,赵岗,冯雪梅,王伟,范月婷,蒋思维,郭劲松..两株优势霉菌对大足千手观音金箔腐蚀的作用机制[J].土木与环境工程学报（中英文）,2026,48(2):30-39,10.基金项目
国家文物保护专项资金(文物保函[2011]262号) （文物保函[2011]262号）
重庆市技术创新与应用发展专项(CSTB2022TIAD-KPX0095) National Special Funds for Cultural Heritage Conservation(Letter on Cultural Heritage Conservation[2011]No.262) （CSTB2022TIAD-KPX0095）
Special Key Project of Chongqing Technology Innovation and Application Development(No.CSTB2022TIAD-KPX0095) （No.CSTB2022TIAD-KPX0095）
