银币表面自组装膜抗变色性能及成膜机理

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

摘要:

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/L NaCl+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

Abstract:

Octadecanethiol (C18SH) self-assembled monolayers (SAM) were prepared on the silver coin surface. The anti-tarnish characteristics of C18SH SAMs were investigated in 0.5 mol/L NaCl+0.01 mol/L Na2S solution by an electrochemical technique. The results indi