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| SIMULATION STUDY ON THE CORROSION PROCESSES OF UNEARTHED BRONZE RELICS |
| Zhanshi Zhang;Shaohua Chen;Zhangru Chen;Yuemiao Liu |
| 东华理工学院地球科学与资源信息管理系 |
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Abstract Modeling study of corrosion processes of unearthed bronze relics was preformed b y EQ3/6,a software package for geochemical modeling of aqueous system.It was rev ealed that:cuprite,malachite and tenorite are the three main kinds of copper-bea ring minerals which would be supersaturated when Cu concentration in the solutio n is high enough(higher than 0.0016 mol/L,0.0079 mol/L separately) under the stu dy conditions.Copper exists in the solution mainly as the species of CuCO3(aq) ,Cu2+ and CuOH+.The corresponding content of CuCO3(aq) would be decrea sed following the deposition of the copper-bearing minerals,nevertheless,Cu2 + and CuOH+ would be increased.The species of Cu and the saturation index of the copper-bearing minerals would be greatly affected by the Eh and pH va lues of the solution.Cuprite is supersaturated in the studied Eh and pH co nd ition(Eh=-0.2 V～0.7 V,pH=5～9.5).Malachite and tenorite are supersatura ted under the conditions Eh>0.2 V,pH>7,while chalcocite is supersaturated under the con d ition of pH<7 and Eh<0.2 V.Water-bronze interaction has been revealed that cuprite,malachite,tenorite,cerussite,cassiterite,copper,lead and tin would be f ormed in a sequence from the early stage to the later stage of the reaction.The simulation calculation also showed the different behavior between Cu and Zn.It h as demonstrated that Cu was leached off easily and the corresponding content in outer corrosion layer is lower than the interior layer,but Sn is just contrary. It is believed the corrosion processes of bronze could be divided into two stag es:at the first stage,cuprite,malachite and tenorite were formed;cassiterite ,cerussite and relic copper,lead and tin were formed in the second stage,which c an be found in the outer layer of bronze.The simulation result not only fixed th e natural corrosion products,but revealed the corrosion processes also which we could not understand by routine methods.So the geochemical modeling study can be used to simulate the bronze corrosion prod uct and its corrosion processes also.
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Received: 10 January 2005
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Corresponding Authors:
Zhanshi Zhang
E-mail: zhszhang@ecit.edu.cn
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