摘要
利用高速电弧喷涂技术在Q235钢基体上制备Zn-Al-Mg-RE涂层,采用环氧改性有机硅树脂对涂层进行封孔,在含硫酸盐还原菌(SRB)海水中浸泡后,采用EIS,PC等方法研究Zn-Al-Mg-RE涂层在SRB一个生长周期内的腐蚀行为,并对涂层进行表面微观形貌和化学成分分析,探讨其腐蚀机理。结果表明:封孔和未封孔的Zn-Al-Mg-RE涂层在含SRB海水中的腐蚀速率均呈先增大后减小的趋势;封孔后Zn-Al-Mg-RE涂层的耐腐蚀性得到较大提高。经过浸泡后的Zn-Al-Mg-RE涂层表面覆盖了一层微生物和腐蚀产物组成的混合物层和钝化膜层,避免了涂层进一步遭受损坏。
The corrosion behavior of Zn-Al-Mg-RE sealed and unsealed coatings fabricated by high-velocity arc spraying on Q235 steel was studied in seawater with sulfate-reducing bacteria(SRB)using electrochemical impedance spectroscopy(EIS),polarization curve(PC),scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results show that the corrosion rate of unsealed and sealed Zn-Al-Mg-RE coatings first increases and then decreases;the corrosion resistance of Zn-Al-Mg-RE coating apparently improves by the sealing treatment.After immersion,the two coatings surface is covered by apassivation film layer of microorganism and corrosion products,which avoids the coating from being further damaged.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2018年第3期91-97,共7页
Journal of Materials Engineering
基金
国家自然科学基金项目(51579087
51609067)
江苏省自然科学基金项目(BK20150806)
