初始pH值和Cl^-浓度对CuCl水解的影响  

Impacts of Initial pH and Cl^- Concentration on Nantokite Hydrolysis

作　　者：和佳乐 王菊琳[1] HE Jiale;WANG Julin(Key Research Base of State Administration of Cultural Heritage for Evaluation of Science and Technology Research in Cultural Relics Protection Field,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学材料科学与工程学院文物保护领域科技评价研究国家文物局重点科研基地,北京100029

出　　处：《中国腐蚀与防护学报》2018年第4期397-402,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51471020)~~

摘　　要：通过设定不同初始p H值、Cl-浓度的溶液环境,观测溶液颜色、记录p H值变化,运用XRD检测产物成分,研究Cu Cl水解反应。结果表明:初始p H值(用H2SO4调节)为2时,水解产物为含铜离子的溶液;初始p H值在2.4~3.0时,Cu Cl水解产物为Cu4SO4(OH)6·2H2O;初始p H值在3.3~7.0时,Cu Cl水解产物为Cu2(OH)3Cl,初始p H值影响Cu Cl水解过程和最终产物。Cl-浓度较小时,Cu Cl水解过程有Cu2O生成阶段;随Cl-浓度增大,Cu2O生成过程缩短,最终生成Cu2(OH)3Cl;当Cl-浓度足够大时,Cu Cl水解直接生成Cu2(OH)3Cl,初始Cl-浓度影响Cu Cl水解进程。Nantokite hydrolysis is the key reaction in the progression of bronze disease on cupreous objects. This transformation was researched in solutions of 0.15%~4%Na Cl with initial p H value 2~7（adjusted with 0.5 mol/L H2 SO4）. The solution color and the p H change were recorded, while the final products of nantokite hydrolysis were characterized by X-ray diffraction analysis. The solution became Cu ioncontaining electrolyte after hydrolysis of nantokite in the solution with p H=2.0. The hydrolysis product is Cu4 SO4（OH）6·2 H2 O in solutions with p H=2.4~3.0. However the hydrolysis product is Cu2（OH）3 Cl in solutions with p H=3.3~7.0. The procession varies with the concentration of Cl-, namely in solutions with low Cl-cocentration the hydrolysis of nantokite generates cuprite at first and then gradually Cu2（OH）3 Cl with the increasing Cl-concentration. In solutions with higher Cl-concentration, the hydrolysis of nantokite generates directly Cu2（OH）3 Cl.

关 键 词：青铜病 CUCL 水解 化学过程 沉淀 

分 类 号：TG174.1[金属学及工艺—金属表面处理]