银币表面自组装膜抗变色性能及成膜机理

稀有金属材料与工程, 2013, 42(7): 1411-1417.

银币表面自组装膜抗变色性能及成膜机理

梁成浩 ^1, , 杨长江 ^2, , 黄乃宝 ^3, , 金光明 ^4,

1.大连海事大学,辽宁大连116026

2.昆明理工大学,云南昆明650093

3.大连海事大学,辽宁大连116026

4.大连海事大学,辽宁大连116026

基金项目: 国家高技术研究发展计划项目(2009AA05Z120)

关键词：银币 , 抗变色 , 自组装膜 , 成膜机理

Anti-tarnish Characteristics and Formation Mechanism of Self-Assembled Monolayers on Surface of Silver Coins

Liang Chenghao ^1, , Yang Changjiang ^2, , Huang Naibao ^3, , Jin Guangming ^4,

1.大连海事大学,辽宁大连116026

2.昆明理工大学,云南昆明650093

3.大连海事大学,辽宁大连116026

4.大连海事大学,辽宁大连116026

Keywords： Silver coin , anti-tarnish , self-assembled monolayers , formation mechanism

利用化学方法在银币表面制备了十八烷基硫醇组装膜(C18SH SAMs),并通过电化学技术研究了其在0.5 mol/LNaCl+0.01 mol/L Na2S溶液中的抗变色性能.结果表明:银表面形成SAMs后腐蚀电位正移30 mV;阴极氧去极化和阳极银的硫化过程均受到抑制,对阴极极化过程的阻滞作用较阳极极化过程明显；银表面成膜后,容抗弧、电荷传递系数Rt增大,双电层电容Cd降低.有效提高银币的抗变色性能.银表面C18SH SAMs的形成过程符合两阶段模型.膜初始吸附阶段(Ⅰ)为2级Langmuir吸附,重整结晶阶段(Ⅱ)为l级Langmuir吸附,动力学公式分别为,Ⅰ阶段:θ(t)=1.706ct/1+1.706ct,Ⅱ阶段:θ(t)=1-e-0.547ct.速率常数与温度的关系为ln(k)=-5826/T+26.5,自组装过程表观活化能E=48.4 kJ/mol,化学吸附为控制步骤.

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