摘要
为研究7A52铝合金表面有机涂层厚度对其性能的影响,采用刮涂棒控制涂层厚度,制备了5种不同厚度的改性石墨烯环氧涂层。通过耐冲击测试、柔韧性测试、摩擦磨损测试、交流阻抗谱及极化曲线测试,分别对不同厚度涂层的耐冲击性能、柔韧性、耐摩擦性能、耐腐蚀性能进行评价,并与未添加改性石墨烯涂层进行对比。改性石墨烯涂层的厚度>70μm时,涂层的机械性能均高于未添加改性石墨烯涂层,正冲、反冲测试均达到50kg·cm,且并未出现裂纹;同样条件下的摩擦磨损测试,未改性石墨烯涂层已经磨穿,大于70μm改性石墨烯涂层仍能保持良好的耐磨性能;交流阻抗测试同样表明,改性石墨烯涂层的耐腐蚀性能得到提高,但当厚度减少至60μm后,涂层耐腐蚀性能下降;大于70μm改性石墨烯涂层较未添加改性石墨烯涂层的腐蚀电流减小,腐蚀电位增加,耐腐蚀性能强于100μm未改性石墨烯涂层。
In order to study the optimal thickness of the organic coating on 7A52 aluminum alloy surface,scratch bar was used to control the thickness of the coating,and modified graphene coatings with different thicknesses were prepared.Through impact resistance test,flexibility test,friction and wear test,AC impedance spectrum and polarization curve test,the impact resistance,flexibility,friction resistance and corrosion resistance of the coating were evaluated respectively and compared with that of coatings without modified graphene.When the thickness of the modified graphene was reduced to 70μm,the mechanical properties of the coating were improved compared with those of the coating without the addition of the modified graphene.The impact resistance tests of the 70μm modified graphene coating with positive impact and recoil reached 50 kg·cm without cracks.Friction and wear tests under the same conditions show that the unmodified graphene coating has been worn through but the 70μm modified graphene coating could still maintain good wear resistance.The AC impedance test also shows that the corrosion resistance of the modified graphene coating was improved.However,when the thickness was reduced to 60μm,the corrosion resistance of the coating decreased.The corrosion current and corrosion potential of 70μm modified graphene coating were lower than those of unmodified graphene coating.The corrosion current of 70μm modified graphene coatings was smaller than that of coatings without modified graphene,but the corrosion potential was higher.The corrosion resistance was better than that of 100μm coatings without modified graphene.
作者
郝松松
孙晓峰
宋巍
李占明
邱骥
HAO Songsong;SUN Xiaofeng;SONG Wei;LI Zhanming;QIU Ji(Deaparment of Equipment,Maintenance and Remanufacturing, Academy of Armored Forces Engineering,Beijing 100072,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2018年第9期9096-9100,9106,共6页
Journal of Functional Materials
基金
装备预研共用技术资助项目(41404010203)
