钨酸钠含量对钛合金钻杆微弧氧化层电偶腐蚀的影响
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摘要
为了提高钛合金钻杆的耐电偶腐蚀的能力,向电解液中添加钨酸钠,在TC4钛合金表面制备了不同钨含量的微弧氧化复合膜层。采用数字式涂层测厚仪、显微硬度计和表面粗糙度仪分别测试微弧氧化层厚度、硬度和粗糙度,采用扫描电镜(SEM)、X射线衍射仪(XRD)分析微弧氧化层的形貌和物相;采用电偶腐蚀测量仪分析微弧氧化层的腐蚀性能。结果表明:随着钨酸钠含量的增加,微弧氧化层的厚度、硬度先增加后减小,当钨酸钠浓度为3 g/L时,厚度和硬度达到最大值,该浓度下的膜层粗糙度相对较小;添加钨酸钠进行微弧氧化处理后,微弧氧化层与S135钢组成偶对后的偶合电流显著降低,偶合电压增大;微弧氧化处理后膜层的电偶腐蚀加速系数明显低于TC4钛合金的; TC4钛合金基体腐蚀最严重,钨酸钠浓度为3 g/L时电偶腐蚀相对较轻。本试验条件下,当钨酸钠添加浓度为3 g/L时,微弧氧化后膜层性能最好。
In order to improve the galvanic corrosion resistance of titanium alloy drill pipe,sodium tungstate was added into the electrolyte and micro-arc oxidation composite layer was formed with different tungsten contents on the surface of TC4 titanium alloy. The thickness,hardness and roughness of the micro-arc oxidation layer were measured by digital coating thickness gauge,microhardness tester and surface roughness tester,respectively. The corrosion resistance of the micro-arc oxidation layer was measured by a galvanic corrosion tester. Results showed that with the increase of the content of sodium tungstate,the thickness and hardness of the micro-arc oxidation layer increased first and then decreased. When the concentration of sodium tungstate was 3 g/L,the thickness and hardness of the film reached the maximum value and the roughness was relatively small. After the addition of sodium tungstate,the coupling current of the pair of micro-arc oxidation layer and S135 steel reduced remarkably,while the coupling voltage increased. The galvanic corrosion acceleration coefficient of the micro-arc oxidation film decreased obviously than that of the TC4 titanium alloy. The TC4 titanium alloy substrate had the most severe corrosion; however,the galvanic corrosion was relatively light when the concentration of sodium tungstate was 3 g/L. Under the experimental conditions,the performance of the micro-arc oxidation film was the best when the concentration of sodium tungstate was 3 g/L.
In order to improve the galvanic corrosion resistance of titanium alloy drill pipe,sodium tungstate was added into the electrolyte and micro-arc oxidation composite layer was formed with different tungsten contents on the surface of TC4 titanium alloy. The thickness,hardness and roughness of the micro-arc oxidation layer were measured by digital coating thickness gauge,microhardness tester and surface roughness tester,respectively. The corrosion resistance of the micro-arc oxidation layer was measured by a galvanic corrosion tester. Results showed that with the increase of the content of sodium tungstate,the thickness and hardness of the micro-arc oxidation layer increased first and then decreased. When the concentration of sodium tungstate was 3 g/L,the thickness and hardness of the film reached the maximum value and the roughness was relatively small. After the addition of sodium tungstate,the coupling current of the pair of micro-arc oxidation layer and S135 steel reduced remarkably,while the coupling voltage increased. The galvanic corrosion acceleration coefficient of the micro-arc oxidation film decreased obviously than that of the TC4 titanium alloy. The TC4 titanium alloy substrate had the most severe corrosion; however,the galvanic corrosion was relatively light when the concentration of sodium tungstate was 3 g/L. Under the experimental conditions,the performance of the micro-arc oxidation film was the best when the concentration of sodium tungstate was 3 g/L.
引文
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[14]刘培宇.铝合金微弧氧化陶瓷层的制备及其耐蚀性的研究[D].燕山:燕山大学,2011:43-51.
[2] YAGISHITA H,OSAWA J. Highly Accurate Hole Making Technology of Ti6Al4V by Orbital Drilling:Effect of Oil Mist[J]. Procedia Manufacturing,2016(5):195-204.
[3] LI Z,DI S. Preparation and properties of micro-arc oxidation self-lubricating composite coatings containing paraffin[J]. Journal of Alloys&Compounds,2017,7(4):1-14.
[4]程法嵩,赵晴,杜楠,等. Zr O2含量对TC4钛合金微弧氧化复合膜摩擦磨损性能的影响[J].材料保护,2016,49(6):1-4.
[5]翟世伟,李晓燕,王梦龙,等.基于铸铝微弧氧化构筑超疏水表面及工艺优化[J].材料保护,2016,49(4):36-39.
[6]陈孝文,李仁仆,张德芬,等.氧化时间对钛合金钻杆微弧氧化膜层结构和性能的影响[J].材料导报,2017,31(1):489-492.
[7] NI A,LIU D,WANG S,et al. Microstructure and Tribological Behavior of a Ti O2/h BN Composite Ceramic Coating Formed via Micro-Arc Oxidation of Ti-6Al-4V Alloy[J].Journal of Materials Science&Technology,2016,32(10):1 071-1 076.
[8]尚伟,陈白珍,石西昌,等.添加剂对AZ91D镁合金微弧氧化膜的影响[J].稀有金属材料与工程,2009,38(2):335-338.
[9] WANG P,WU T,XIAO Y T,et al. Effects of Ce(SO4)2concentration on the properties of micro-arc oxidation coatings on ZL108 aluminum alloys[J]. Materials Letters,2016,182:27-31.
[10]蒋百灵,赵仁兵,梁戈,等. Na2WO4对铝合金微弧氧化陶瓷层形成过程及耐磨性的影响[J].材料导报,2006,20(9):155-157.
[11]陈喜娣,罗强,蔡启舟,等. Na2WO4浓度对海水淡化用6061铝合金MAO陶瓷膜层的结构及耐蚀性影响[J].功能材料,2015,46(21):21 054-21 059.
[12] ZHENG H Y,WANG Y K,LI B S,et al. The effects of Na2WO4concentration on the properties of microarc oxidation coatings on aluminum alloy[J]. Materials Letters,2005,59(2):139-142.
[13]宁铮. TC4钛合金微弧氧化膜层的摩擦性能研究[D].南昌:南昌航空大学,2010:51-57.
[14]刘培宇.铝合金微弧氧化陶瓷层的制备及其耐蚀性的研究[D].燕山:燕山大学,2011:43-51.
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