热喷涂AlCoCe非晶合金自修复涂层耐腐蚀

热喷涂Al-Co-Ce非晶合金自修复涂层耐腐蚀性能及机理研究

摘要

非晶合金因其耐蚀性能强而受到广泛的关注，其中铝基非晶合金由于比强度高、耐蚀性好、价格低廉成为新型涂层重点研发对象。本课题制备Al86.0Co7.6Ce6.4合金并通过气雾化技术制备金属粉末，然后通过超音速火焰热喷涂技术（HVOF）制备合金涂层，并通过现代分析检测技术和腐蚀实验确定涂层的结构、耐蚀性能。实验结果表明，制备的母合金成分均匀，其成分在非晶形成范围之内。气雾化制备的小粒径合金粉末时，因其较高的冷却速度而具有一定含量的非晶结构。采用小粒径粉末制备的合金涂层结构更为致密，厚度更为均匀，耐蚀性能也更好，其耐蚀机理除传统的机械保护外，还表现在涂层对基体具有较强的阴极保护作用，此外，腐蚀过程中涂层也可释放缓蚀离子（Ce3+）。

关键词：铝基非晶合金涂层；热喷涂；气雾化技术；耐腐蚀机理

Study on corrosion resistance and mechanism of self -repairing coatings for thermal spraying AlCoCe

amorphous alloy

Abstract

At present, many anticorrosive coatings of amorphous alloy are favored by researchers due to their strong corrosion resistance. Because of high specific strength, good corrosion resistance and low price, al-based amorphous alloy has become the key research and development object of new coatings. In this paper, Al86.0Co7.6Ce6.4as-cast alloy was smelted. Then, metal powder was made by aerosol technology. At last, amorphous coatings were made by high velocity oxyfuel spraying (HVOF) and the structure and corrosion resistance were characterized by modern analysis-detection technology and corrosion experiment. The experimental results show that the composition of the as-cast alloy is uniform, its composition is in the range of amorphous formation. The small scale powder made by aerosol technology have certain content of amorphous structure due its high cooling rate. The metal coatings made by small scale powder have a more compact structure, a more uniform thickness and a better corrosion resistance performance. Besides the traditional mechanical protection, the corrosion resistance mechanism is mainly manifested in the strong cathodic protection of the coating on the substrate and the release of corrosion inhibitor particles (Ce3+) in the process of corrosion.

Keywords：Aluminium base amorphous coating；Thermal spraying；Aerosol technology；Mechanism of corrosion resistance

目录

第1章绪论 (1)

1.1 铝基非晶合金 (1)

1.1.1 概念 (1)

1.1.2 非晶涂层性能 (1)

1.1.3 研究进展 (2)

1.2 热喷涂技术 (2)

1.2.1 概念及分类 (2)

1.2.2 研究进展 (4)

1.3 本文研究内容 (5)

第二章实验方法 (6)

2.1 实验设备与材料 (6)

2.2 实验方法 (7)

2.2.1 母合金的冶炼及表征 (7)

2.2.2 气雾化制备合金粉末及表征 (8)

2.2.3 热喷涂技术制备合金涂层 (9)

2.2.4 合金涂层性能的表征 (10)

第3章实验结果与讨论 (13)

3.1 Al-Co-Ce母合金性能表征及耐蚀情况 (13)

3.1.1 母合金结构表征 (13)

3.1.2 合金相结构 (15)

3.1.3 合金的腐蚀机理及耐蚀性能 (15)

3.1.4 2024铝合金腐蚀行为研究 (17)

3.2 合金粉末制备和表征 (19)

3.2.1 粉末形貌 (20)

3.2.2 粉末结构 (21)

3.3 合金涂层表征及耐蚀性能 (22)

3.3.1 涂层表征 (22)

3.3.2 涂层耐蚀性能 (25)