[例33]三元牺牲阳极镀层在油田管道防腐中的应用

阳极镀层电位相对于被涂覆的金属本体更负。当内、外表面涂覆阳极镀层的金属管道处于腐蚀介质中时，阳极镀层会失去电子，成为电化学腐蚀的阳极，从而使金属得到保护。三元牺牲阳极镀层主要成分为Zn—Al—Mg合金，其中少量的Al和Mg使得极化初期产生较大电流，极化稳定后所需保护电流小，由成分较多的Zn来提供。该镀层具有对碳钢驱动电位不高、电流效率高、使用寿命长、成本低的特点，适合应肘于高矿化度、低电阻率的油田采出液中。

杂质离子对镀锌层的影响

0前言 锌是一种灰白色金属,由于它所特有的电化学性能,使其在电池与表面处理行业有着广泛的应用。镀锌层对钢铁基体来说是典型的阳极镀层,所以对钢铁基体有着非常好的电化学保护作用[1-5]。镀锌电解液具有成分简单、

Electrochemical behaviors of anodic alumina sealed by Ce-Mo in NaCl solutions

The elimination of toxic materials in sealing methods for anodic films on 1070 aluminum alloy was studied. The new process uses chemical treatments in cerium solution and an electrochemical treatment in a molybdate solution. Potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) were used to study the influences of sealing methods on the corrosion behavior of anodic films in NaCl solutions. The results show that the Ce-Mo sealing makes the surface structure and morphology of anodic films uniform and compact. Ce and Mo produce a cooperative effect to improve the corrosion resistance of anodic films. Anodic films sealed by Ce-Mo provide high corrosion resistance both in acidic and basic solutions.