磷酸铝铬封孔处理对热喷涂WC-12Co涂层耐蚀性的影响

doi:10.11933/j.issn.1007-9289.20170215001

PDF(14469 KB)

中国表面工程 ›› 2017, Vol. 30 ›› Issue (4) : 56-63. DOI: 10.11933/j.issn.1007-9289.20170215001

扫码查看或转发全文

第十一届全国表面工程大会论文

磷酸铝铬封孔处理对热喷涂WC-12Co涂层耐蚀性的影响

李乐,陈汪林,蔡飞,张林,张世宏

作者信息 +

Effects of Chromium-Aluminum-Phosphate Sealing Treatments on Corrosion Resistance of Thermal Sprayed WC-12Co Coatings

LI Le, CHEN Wang-lin, CAI Fei, ZHANG Lin and ZHANG Shi-hong

Author information +

文章历史 +

摘要

以磷酸铝铬溶液和Cr₂O₃粉末为原料制备了一种封孔剂，并对WC-12Co热喷涂涂层进行封孔处理。利用XRD、SEM、EDS以及TG-DSC分别对磷酸铝铬的物相、封孔前后涂层表面形貌、固化特性和耐热性能进行检测分析。利用动电位极化电化学测试和热震试验分别对封孔前后涂层的抗腐蚀性和固化后的磷酸铝铬层的抗热震性能进行研究。结果表明：磷酸铝铬的固化温度在250 ℃左右，在700 ℃内体系无任何热效应发生，材料具有良好的耐热性能。固化后涂层表面致密，磷酸铝铬对涂层孔隙具有良好的填充作用，明显降低了涂层的孔隙率。封孔后的涂层具有较高的自腐蚀电位和较小的腐蚀电流密度，涂层耐蚀性显著提高。在450 ℃下进行热震试验，当热震次数一定时（热循环100次），添加填料的磷酸铝铬层的剥落面积低于未添加填料的磷酸铝铬层，表现出较高的抗热震性能。

Abstract

The sealant was prepared with the chromium-aluminum-phosphate and the Cr₂O₃ powder. The chromium-aluminum-phosphate sealants were used to seal the thermal sprayed WC-12Co coatings. XRD, SEM, EDS and TG-DSC were used to examine the phases, surface morphologies, curing characteristics and heat resistance of the WC-12Co coatings with and without chromium-aluminum-phosphate sealant, respectively. Potentiodynamic polarization electrochemical test and thermal shock experiment were also used to examine the corrosion resistance and thermal shock resistance of the WC-12Co coatings with and without chromium-aluminum-phosphate films. The results show that the curing temperature is about 250℃ and the sealant has excellent heat resistance below 700℃. Besides, the chromium-aluminum-phosphate could fill into the pores, reducing the porosity of the coating. The WC-12Co coatings after sealant treatment show higher corrosion potential and smaller corrosion current density, indicating the improved corrosion resistance. After thermal cycling for 100 times under 450℃, the spalling areas of the sealant layer with Cr₂O₃ powder were smaller than that of the sealant without Cr₂O₃ filler, which showed better thermal shock resistance for the sealant layer with Cr₂O₃ powder.

导出引用

李乐,陈汪林,蔡飞,张林,张世宏. 磷酸铝铬封孔处理对热喷涂WC-12Co涂层耐蚀性的影响[J]. 中国表面工程, 2017, 30(4): 56-63 https://doi.org/10.11933/j.issn.1007-9289.20170215001

LI Le, CHEN Wang-lin, CAI Fei, ZHANG Lin and ZHANG Shi-hong. Effects of Chromium-Aluminum-Phosphate Sealing Treatments on Corrosion Resistance of Thermal Sprayed WC-12Co Coatings[J]. China Surface Engineering, 2017, 30(4): 56-63 https://doi.org/10.11933/j.issn.1007-9289.20170215001

参考文献

[1] MA N, GUO L, CHENG Z X, et al. Improvement on mechanical properties and wear resistance of HVOF sprayed WC-12Co coatings by optimizing feedstock structure[J]. Applied Surface Science, 2014, 320:364-371.
[2] WANG Q, CHEN Z H, DING Z X. Performance of abrasive wear of WC-12Co coatings sprayed by HVOF[J]. Tribology International, 2009, 42:1046-1051.
[3] WANG G, XING C, TAO F, et al. Enhancement in the corrosion resistance of WC coatings by adding a Fe-based alloy in simulated seawater[J]. Surface & Coatings Technology, 2016, 305:62-66.
[4] AL-MUTAIRIA S, HASHMIA M S J, YILBAS B S, et al. Microstructural characterization of HVOF/plasma thermal spray of micro/nano WC-12% Co powders[J]. Surface & Coatings Technology, 2015, 264:175-186.
[5] BOLELLI G, LUSVARGHI L, GIOVANARDI R. A comparison between the corrosion resistances of some HVOF-sprayed metal alloy coatings[J]. Surface & Coatings Technology, 2008, 202:4793-4809.
[6] VIPPOLA M, AHMANIEMI S, KERÄNEN J, et al. Aluminum phosphate sealed alumina coating:characterization of microstructure[J]. Materials Science & Engineering, 2002, 22:1-8.
[7] AHMANIEMI S, VUORISTO P, MÄNTYLÄ T, et al. Improved sealing treatments for thick thermal barrier coatings[J]. Surface & Coatings Technology, 2002, 151-152:412-417.
[8] LISCANOA S, GILA L, STAIA M H. Effect of sealing treatment on the corrosion resistance of thermal-sprayed ceramic coatings[J]. Surface & Coatings Technology, 2004, 188-189:135-139.
[9] WANG Y, JIANG S L, ZHENG Y G. Effect of porosity sealing treatments on the corrosion resistance of high-velocity oxy-fuel (HVOF)-sprayed Fe-based amorphous metallic coatings[J]. Surface & Coatings Technology, 2011, 206:1307-1318.
[10] 孙寅, 霍冀川, 雷永林. 磷酸铬铝粘结剂的制备及其热处理中的相变[J]. 材料导报, 2011, 25(10):98-101. SUN Y, HUO J C, LEI Y L. Preparation of chromium-aluminum-phosphate binder and phase evolution during heat treatment[J]. Materials Reviews, 2011, 25(10):98-101(in Chinese).
[11] 纪柱. 含铬的磷酸盐[J]. 无机盐工业, 2005, 37(8):8-11. JI Z. Chromium-containing phosphate[J]. Inorganic Chemicals Industry, 2005, 37(8):8-11(in Chinese).
[12] 杨猛, 霍冀川, 雷永林, 等. 氧化铜-磷酸铬铝粘结剂制备及热处理相变研究[J]. 非金属矿, 2014, 37(5):43-45. YANG M, HUO J C LEI Y L, et al. Preparation of copper oxide-aluminum-chromium-phosphate binder and phase evolution research during heat treatment[J]. Non-Metallic Mines, 2014, 37(5):43-45(in Chinese).
[13] 田帅, 霍冀川, 雷永林, 等. ZnO及填料对磷酸铬铝基复合材料性能的影响[J], 功能材料, 2013, 7(44):979-982. TIAN S, HUO J C, LEI Y L, et al. The influence of zinc oxide and fillers on the properties of aluminum-chromium-phosphate matrix composite[J]. Function Materials, 2013, 7(44):979-982(in Chinese).
[14] 王政阅, 徐明霞, 梁辉, 等. 磷酸铝铬粘结剂固化机理的研究[J]. 稀有金属材料与工程, 2008, 37(1):565-568. WANG Z Y, XU M X, LANG H, et al. Studies on the curing mechanism of aluminum-chromium-phosphate binder[J]. Rare Metal Materials & Engineering, 2008, 37(1):565-568(in Chinese).
[15] PITAK Y N, CHURILOVA Y V. The effect of aluminum phosphate binder on the crystallization of mullite-silica fibers[J]. Refractories & Industrial Ceramics, 2004, 45(4):275.
[16] 王珏, 刘晓东, 于倩, 等. 磷酸铝铬溶液对Al₂O₃-ZrO₂-SiO₂耐磨体系的影响[J]. 黑龙江科学, 2015, 6(4):12-15. WANG Y, LIU X D, YU Q, et al. The effects of chrome aluminum phosphate solution on the Al₂O₃-ZrO₂-SiO₂ wearable system[J]. Heilongjiang Science, 2015, 6(4):12-15(in Chinese).
[17] ZENG Z S, SAKODAA N, TAJIRIA T, et al. Structure and corrosion behavior of 316 L stainless steel coatings formed by HVAF spraying with and without sealing[J]. Surface & Coatings Technology, 2008, 203:284-290.
[18] 陈宁, 高祀建, 霍冀川, 等. 不同固化剂对磷酸铬铝固化行为的影响[J]. 硅酸盐通报, 2014, 33(6):1347-1353. CHEN N, GAO S J, HUO J C, et al. Effect of different curing agents on aluminum chromium phosphates curing behavior[J]. Bulletin of the Chinese Ceramic Society, 2014, 33(6):1347-1353(in Chinese).
[19] 杨小波, 黄玉东, 张杰, 等. 磷酸盐基耐热复合材料的制备与性能[J]. 化学与黏合, 2005, 27(2):67-70. YANG X B, HUANG Y D, ZHANG J, et al. Preparation and properties of phosphate base heat-resisting composites[J]. Chemistry and Adhesion, 2005, 27(2):67-70(in Chinese).
[20] 张鹏杰, 吴玉程, 曹玉杰, 等. 前处理工艺对NdFeB表面真空蒸镀Al薄膜结构及性能的影响[J]. 中国表面工程, 2016, 29(4):49-59. ZHANG P J, WU Y C, CAO Y J, et al. Effects of pretreatment technologies on structure and propertiesof Al coatings on sintered NdFeB substrates via vacuum evaporation[J]. China Surface Engineering, 2016, 29(4):49-59(in Chinese).
[21] 刘正海, 王海滨, 霍冀川, 等. 高硅氧纤维布增强磷酸铬铝复合材料的性能研究[J], 非金属矿, 2012, 35(2):36-38. LIU Z H, WANG H B, HUO J C, et al. Properties of high silica cloth reinforced phosphate of chrome-alumina matrix composite[J]. Non-Metallic Mines, 2012, 35(2):36-38(in Chinese).