青铜在土壤中局部腐蚀过程的化学行为

CHEMICAL BEHAVIOR OF BRONZE LOCALIZED CORROSION IN SOIL

用模拟闭塞电池法 (O C )对青铜文物在模拟土壤溶液 (0 0 2 8mol·L-1NaCl +0 0 1mol·L-1Na2 SO4+0 0 16mol·L-1NaHCO3 )中的腐蚀行为进行了研究 ,清楚地演示了青铜局部腐蚀过程中环境介质离子、阳极腐蚀产生的阳离子等物质的迁移、富集和沉积规律 ,得出铜的溶解因子 fCu随通电时间的变化关系 ,即从最初锡的溶解速度大于铜的溶解速度逐渐演变为铜的溶解速度大于锡的溶解速度 .闭塞区内的阳离子明显地向主体溶液中迁移 .

This paper describes a study on the corrosion behavior of archaeological bronze in simulated soil solution (0.028 mol· L -1 NaCl+0.01 mol·L -1 Na 2SO 4+0.016 mol·L -1 NaHCO 3) by means of simulated occluded cell (O.C.).The present study illustrates the migration, enrichment and deposition patterns of ions in the environment and the cations produced by anodic dissolution during localized corrosion of bronze.The relationship between copper solution factor f Cu and time is given.The dissolution rate of Sn is higher than that of Cu during the initial period of dissolution. It gradually reverses the trend of dissolution rate i.e. the dissolution rate for Cu is higher than that for Sn. The migration of cations to the bulk solution is obviously observed.