4种紧固件用涂层性能对比分析

目的 将4种不同涂料涂覆在相同紧固件上,在相同测试条件下研究它们的表面形貌、耐腐蚀、抗疲劳等性能,最后从中筛选出可替代传统HW-A的潜在涂料,进一步丰富现役钛合金紧固件表面涂层材料品种。方法 利用3D共聚焦、电化学阻抗谱、中性盐雾、加速环境谱等方法评价紧固件表面涂层性能,研究每种涂层的截面形貌、表面形貌、粗糙度、抗腐蚀、加速疲劳寿命等,然后综合分析其关键性能。结果 采用3D共聚焦、电化学阻抗谱、中性盐雾、加速谱等方法初步摸清了4种涂料的性能特点,PTFE涂料的表面粗糙度较CZ和GO降低约50%,PTFE电化学阻抗谱半径较其他3种涂层大大提高。加速谱更清晰表明,PTFE涂料比现役HW-A铝涂料的疲劳寿命提高22.8%,PTFE涂料能满足当下性能需要。结论 PTFE涂料较市场上筛选出的石墨烯涂料、含铬酸盐聚氨酯涂料的施工性能更好、关键性能更优、更适合紧固件使用,在未来产品应用中有较大的潜力。

Comparative Analysis on Properties of 4 Kinds of Coatings for Fasteners

The work aims to apply 4 kinds of different coatings to the same fasteners to test their surface morphology, corrosion resistance and anti-fatigue under the same test conditions, screen out the potential coatings to replace traditional HW-A coatings, to enrich the varieties of surface coating materials for titanium alloy fasteners. 3D confocal, Ac impedance spectrum, neutral salt spray, accelerated spectrum and other methods were adopted to evaluate the properties of coatings on the fastener surface. The section morphology, surface morphology, roughness, corrosion resistance and anti-fatigue of each coating were studied and their key properties were analyzed comprehensively. The properties of the four kinds of coatings were initially determined by 3D confocal, Ac impedance spectrum, neutral salt spray, accelerated spectrum and other methods. The surface roughness of PTFE coatings was about 50% lower than that of CZ and GO coatings. The radius of PTFE electrochemical impedance spectrum was greatly improved than the other 3 kinds of coatings. The life of PTFE coatings was improved by 22.8% than that of the serving aluminum coatings HW-A, and PTFE coatings, which can basically meet the present production needs. Comparing with graphene coatings and polyurethane coatings containing chromate, PTFE coatings have the better workability, key properties and they are more suitable for fasteners and they have great potential in the future.