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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,适合应用于高矿化度、低电阻率的油田采出液中。三元牺牲阳极溶解涂覆在金属短节内外壁表面,将其内部引入网状骨架以防止阳极镀层脱落,形成三元牺牲阳极镀层保护器,设计寿命在4年以上。该装备应用于塔河油田井下注水管道6年以来,管道
The anode plating potential is more negative with respect to the coated metal body. When the inner and outer surfaces of the metal pipe coated with the anode plating are in corrosive medium, the anode plating loses electrons and becomes an electrochemical corrosion anode, thereby protecting the metal. Ternary sacrificial anode coating is mainly composed of Zn-Al-Mg alloy, in which a small amount of Al and Mg makes a large current in the initial polarization, polarization protection after the required current protection is small, provided by more Zn. The coating has the characteristics of low driving potential of carbon steel, high current efficiency, long service life and low cost, and is suitable for oilfield production fluids with high salinity and low resistivity. Ternary sacrificial anode dissolved coated on the inner and outer wall of the metal short section, the internal mesh structure to prevent the matrix from falling off, the formation of ternary sacrificial anode coating protector, the design life of 4 years. The equipment used in Tahe Oilfield underground water pipelines since 6 years, the pipeline