Ni-P-TiO2复合镀层的制备及其性能
Preparation and Properties of Ni-P-TiO2 Composite Coatings
摘 要
通过向Ni-P镀液中添加TiO2溶胶（2～11 mL/L）的方法在AZ31B镁合金表面制备了Ni-P-TiO2复合镀层。用电化学方法评价了复合镀层在3.5%（质量分数）NaCl溶液中的腐蚀行为；用扫描电镜（SEM）、透射电镜（TEM）和X射线衍射仪（XRD）分析了Ni-P-TiO2复合镀层的微观形貌和显微组织结构；用维氏硬度仪测试了Ni-P-TiO2复合镀层的显微硬度。结果表明：随着TiO2溶胶含量的增加，复合镀层组织中菜花状胞状颗粒的尺寸逐渐减小，硬度和耐蚀性均是先增大后减小；当TiO2含量为8 mL/L时，镀层的结构致密，且无明显缺陷和裂纹产生，其显微硬度和耐蚀性均达到最高；Ni-P-TiO2复合镀层有明显的点蚀电位，说明镀层在腐蚀介质中形成了钝化层，对镁合金起到更好的保护作用。
Ni-P-TiO2复合镀层
性能
TiO2 sol
Ni-P-TiO2 composite coating
property
Abstract
Ni-P-TiO2 composite coatings were prepared on surface of AZ31B magnesium alloy by adding TiO2 sol (2-11 mL/L) to Ni-P bath. The corrosion behavior of the composite coating in 3.5% (mass fraction) NaCl solution was evaluated by electrochemical method. The micro morphology and microstructure of the composite coatings were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The microhardness of the composite coatings was tested by Vickers hardness tester. The results show that the size of cauliflower-like particles in microstruture decreased with raising the TiO2 sol content, and the microhardness and corrosion resistance increased first and then decreased. When the TiO2 sol content was 8 mL/L, the composite coating had a compact structure without obvious defects and cracks, and its microhardness and corrosion resistance hit the best values. The Ni-P-TiO2 composite coatings had obvious pitting potential, indicating that the coating had formed a passivation layer in the corrosive medium, which provided a better protective effect for magnesium alloy.
中图分类号 TB304 DOI 10.11973/fsyfh-202008003
所属栏目 试验研究
基金项目
收稿日期 2019/1/19
修改稿日期
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引用该论文: SONG Jiawen,WANG Ruihong. Preparation and Properties of Ni-P-TiO2 Composite Coatings[J]. Corrosion & Protection, 2020, 41(8): 11
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【7】温泉,马旭. 镀镍对镁合金AZ61耐腐蚀性能的影响[J]. 腐蚀与防护,2015,36(1):27-31.
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【9】ARAGHI A,PAYDAR M H. Electroless deposition of Ni-W-P-B4C nanocomposite coating on AZ91D magnesium alloy and investigation on its properties[J]. Vacuum,2013,89(1):67-70.
【10】KARTHIKEYAN S,RAMAMOORTHY B. Effect of reducing agent and nano Al2O3 particle on the properties of electroless Ni-P coating[J]. Applied Surface Science,2014,307(1):654-660.
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【14】KRISHNAVENI K,SANKARA T S N. Corrosion resistance of electrodeposited Ni-B and Ni-B-Si3N4 composite coatings[J]. Journal of Alloys Compounds,2009,480(2):765-770.
【15】KRISHNAVENI K,SANKARA T S N. Electrodeposited Ni-B coatings:formation and evaluation of hardness and wear resistance[J]. Materials Chemistry and Physics,2006,99(2/3):300-308.
【16】KRISHNAVENI K,SANKARA T S N. Wear resistance of electrodeposited Ni-B and Ni-B-Si3N4[J]. Journal of Alloys Compounds,2008,466(1/2):412-420.
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