摘要
目的获得厚度可控的Fe-Al合金层,提高Q235钢板的耐腐蚀性能和成形加工性能。方法通过创新涂层制备方法,以Q235为基体金属,以铝箔为镀层金属,采用压力辅助固态成形法在Q235钢板表面制备耐腐蚀铝涂层(Al_(P)/Q235)。通过三点弯曲实验研究Al_(P)/Q235的成形性能,通过全浸泡腐蚀失重实验、电化学实验分析研究Al_(P)/Q235的腐蚀性能,利用扫描电子显微镜及其附带的能谱仪对铝涂层弯曲变形后的显微结构、微观组织和元素组成进行表征。探讨压力辅助固态成形铝涂层对基体的保护行为,并阐明铝涂层的腐蚀防护机理。结果在采用压力辅助固态成形法制备的铝涂层钢板中,铝箔与Q235基体实现了冶金结合,生成了厚度大约为44μm的Fe-Al合金层,合金层主要由“颗粒状”的FeAl_(3)和“锯齿状”的Fe_(2)Al_(5)相层组成。通过三点弯曲试验测得Al_(P)/Q235的弯曲强度为255MPa,与Q235相比,提高了11.8%。在NaCl(质量分数为3.5%)溶液中全浸泡腐蚀25d后,Al_(P)/Q235的平均静态腐蚀速率为0.21mg/(dm·d),约为Q235的1/10。在NaCl(质量分数为3.5%)溶液中浸泡,并进行电化学实验,测得Al_(P)/Q235的电流密度J_(corr)为1.583μA/cm^(2),约为Q235的1/27。结论采用压力辅助固态成形法制备的Al_(P)/Q235,获得了厚度可控的Fe-Al合金层,有效提高了其耐腐蚀性能和成形加工性能。
The work aims to prepare aluminum coating on Q235 steel plate by pressure-assisted solid state forming,which is an innovative coating preparation method,and can improve its corrosion resistance and formability without damaging the properties of the matrix material.The corrosion resistance and formability of aluminum coated Q235(Al_(P)/Q235)steel plate are studied.A Q235 steel plate and an aluminum foil were sanded and polished and then cleaned and dried.An aluminum foil with a thickness of 100 m and a Q235 steel with a thickness of 1 mm were stacked and pressed in a mold for 1 h.The pre-pressed aluminum foil and Q235 steel were sintered in a hot pressing sintering furnace under a vacuum of 10 MPa,a temperature of 630℃and a pressure of 30 MPa.The surface morphology,cross-section morphology and element composition of the samples were observed and analyzed by super depth of field three-dimensional microscope,electron scanning microscope(SEM)and energy dispersive spectrometer(EDS).The phase structure of the coating was characterized by X-Ray diffraction(XRD).The formability and corrosion resistance of the aluminum coated Q235 steel plate were tested by three-point bending test,full immersion test and electrochemical test,and the corrosion protection mechanism of Al_(P)/Q235 was clarified.The thickness of Fe-Al alloy layer was uniform and about 44μm.The Fe-Al alloy layer was composed of"granular"FeAl_(3) phase layer and"serrated"Fe_(2)Al_(5) phase layer.In the Al-Fe alloy layer,the Fe2Al5 phase accounted for the main component,and the FeAl_(3) phase accounted for only a small part of the intermetallic compound.The bending strength of Al_(P)/Q235 was 255 MPa,which was 11.8%higher than that of Q235.The results of full immersion test showed that the static corrosion rate of Al_(P)/Q235 was 0.21 mg/(dm·d),which was about 1/10 of Q235.The open circuit potential test results showed that the Eocp value of Q235 decreased from−0.5 V to−0.7 V.The Eocp of Al_(P)/Q235 was stable at−0.725 V.An oxide film was formed on th
作者
赵雪妮
尹琴月
赵振洋
刘家豪
王朋义
王贤贤
ZHAO Xue-ni;YIN Qin-yue;ZHAO Zhen-yang;LIU Jia-hao;WANG Peng-yi;WANG Xian-xian(College of Mechanical&Electrical Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2023年第6期296-306,共11页
Surface Technology
基金
陕西省重点研发计划(2018GY-168)
陕西高校青年创新团队建设项目(2019)
陕西省教育厅青年创新团队建设科研计划(21JP018)。
关键词
铝涂层
成形加工性能
压力辅助固态成形
冶金结合
静态腐蚀速率
耐腐蚀性能
aluminum coating
formability
pressure-assisted solid state forming
metallurgical bonding
static corrosion rate
corrosion resistance
