钻具螺纹表面镀镍钨合金的应用研究  

Application of Ni-W Alloy Plating on Drilling Tool Thread Surface

作　　者：鲁喜宁 丁洁琼 余世杰[1] LU Xi-ning;DING Jie-qiong;YU Shi-jie(Shanghai Hilong Petroleum Tubular Goods Research Institute,Shanghai 200949,China)

机构地区：[1]上海海隆石油管材研究所,上海200949

出　　处：《材料保护》2021年第4期145-148,157,共5页Materials Protection

摘　　要：钻具接头失效大多发生在螺纹表面,对螺纹表面镀铜、磷化处理能有效缓解螺纹粘扣,但镀铜、磷化工艺污染严重,为此,在钻具接头螺纹表面制备镍钨合金镀层,研究了表面镀镍钨合金对钻具螺纹性能的影响。试验表明:镍钨合金镀层显微硬度在700~900 HV_(1 N),为基体材料硬度的2~3倍。镍钨合金镀层厚度在螺纹的牙顶面、牙侧面和牙底面依次降低,呈不均匀分布,对螺纹牙工作时的啮合度有不利的影响;镍钨合金镀层接头在前3次上卸扣试验中发生表面损伤。疲劳寿命试验结果发现镍钨合金镀层试样的疲劳寿命为对照组试样的20%左右。分析认为镍钨合金镀层的非晶结构明显提高了镀层硬度,但塑性变形能力差,降低了材料的疲劳性能,镀层厚度的不均匀导致接头严重粘扣。The failure of drilling tool joint mostly occurs on the surface of thread.Copper plating and phosphating treatment can effectively relieve thread sticking,but the pollution of copper plating and phosphating process is serious,for this,Ni-W alloy coating on thread surface of drilling tool joint was prepared and the effect of Ni-W alloy plating on the thread performance of drilling tools was studied.Experimental results showed that the thickness of Ni-W alloy coating was 10~60μm.The microhardness of Ni-W alloy coating was 700~900 HV_(1 N),which was 2~3 times of that of the substrate materials.The thickness of the Ni-W alloy coating was uneven and decreased successively on the top,side and bottom surfaces of the thread teeth,which had an adverse effect on the meshing degree of thread teeth during working.Ni-W alloy coating joint was damaged in the first 3 make-up and break-down tests.Fatigue life test showed that the fatigue life of Ni-W alloy coating samples was about 20%of the samples without coatings.It was believed that the amorphous structure of the Ni-W alloy coating that significantly increased the hardness of coating,but reduced the plastic deformation ability and fatigue performance of the material.Besides,the uneven thickness of the coating led to serious sticking of the joint.

关 键 词：钻具 螺纹 镍钨合金 表面镀层 性能 

分 类 号：TQ153[化学工程—电化学工业]