Mondal Jayanta, Kozlova Jekaterina, Sammelselg Väino
J Nanosci Nanotechnol. 2015 Sep;15(9):6747-50. doi: 10.1166/jnn.2015.10774.
Stainless steel is the most widely used alloy for many industrial and everyday applications, and protection of this alloy substrate against corrosion is an important industrial issue. Here we report a promising application of graphene oxide and graphene nanoplatelets as effective corrosion inhibitors for AISI type 304 stainless steel alloy. The graphene oxide and graphene coatings on the stainless steel substrates were prepared using spin coating techniques. Homogeneous and complete surface coverage by the graphene oxide and graphene nanoplatelets were observed with a high-resolution scanning electron microscope. The corrosion inhibition ability of these materials was investigated through measurement of open circuit potential and followed by potentiodymamic polarization analysis in aqueous sodium chloride solution before and after a month of immersion. Analyzed result exhibits effective corrosion inhibition for both substrates coated with graphene oxide or graphene nanoplatelets by increasing corrosion potential, pitting potential and decreasing passive current density. The corrosion inhibition ability of the coated substrates has not changed even after the long-term immersion. The result showed both graphene materials can be used as an effective corrosion inhibitor for the stainless steel substrates, which would certainly increase lifetime the substrate. However, long-term protection ability of the graphene coated susbtsrate showed somewhat better inhibition performance than the ones coated with graphene oxide.
不锈钢是许多工业和日常应用中使用最广泛的合金，保护这种合金基体免受腐蚀是一个重要的工业问题。在此，我们报告了氧化石墨烯和石墨烯纳米片作为AISI 304型不锈钢合金有效腐蚀抑制剂的一项有前景的应用。使用旋涂技术在不锈钢基体上制备了氧化石墨烯和石墨烯涂层。通过高分辨率扫描电子显微镜观察到氧化石墨烯和石墨烯纳米片均匀且完全覆盖了表面。通过测量开路电位，随后在浸泡一个月前后的氯化钠水溶液中进行动电位极化分析，研究了这些材料的缓蚀能力。分析结果表明，涂覆有氧化石墨烯或石墨烯纳米片的两种基体，通过提高腐蚀电位、点蚀电位和降低钝化电流密度，表现出有效的腐蚀抑制作用。即使经过长期浸泡，涂覆基体的缓蚀能力也没有改变。结果表明，两种石墨烯材料都可作为不锈钢基体的有效腐蚀抑制剂，这肯定会延长基体的使用寿命。然而，石墨烯涂层基体的长期保护能力显示出比氧化石墨烯涂层的基体稍好的抑制性能。
