采用直流电镀法,在30CrMo抽油杆表面分别制备了单层Fe-Ni-W、Ni-W-P、Ni-W和双层Fe-Ni/Ni-W-P合金.室温下,将上述镀覆了钨合金的抽油杆浸泡在饱和H_2S水溶液中30 d,采用失重法、扫描电镜、X射线衍射等方法对其耐腐蚀进行了分析.结合阳极极化曲线测量,探讨了双层Fe-Ni/Ni-W-P镀层的耐蚀机理.实验结果表明:钨合金镀层使抽油杆的耐腐蚀性得到了显著提高,从而可延长其使用寿命.双层Fe-Ni.Ni-W-P合金镀层的耐蚀性最好,Fe-Ni层与Ni-W-P层之间的电势差达到了150 mV,起到很好的保护作用.
Fe-Ni-W, Ni-P-W, Ni-W and Fe-Ni/Ni-P-W alloys were prepared on the surface of 30CrMo sucker rod by direct-current electroplating. Their corrosion resistance was studied after immersion in saturated aqueous H_2S solution at room temperature for 30 days by weight loss method, scanning electron microscopy and X-ray diffraction. The anticorrosion mechanism of the double-layer Fe-Ni/Ni-W-P coating was discussed in combination with anodic polarization curve measurement. The experimental results showed that the tungsten alloy coatings can protect sucker rod from the corrosion due to H_2S effectively and hence extending their service lives, especially of the double-layer Fe-Ni/Ni-P-W coating. The electric potential difference between Fe-Ni and Ni-W-P layers is 150 mV, which results in a good protection of the sucker rod.
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