The mechanical responses under superelastic loading cycles and the corrosion protection capacity of two graphene–based coatings applied to a NiTi alloy were evaluated. Graphene oxide (GO) and a composite of reduced graphene oxide (rGO) incorporated in a block copolymer of styrene–ethylene–butylene–styrene (SEBS) were deposited on the substrate via dip–coating. The morphology of the coatings was characterized by scanning electron microscopy (SEM) before and after uniaxial loading cycles up to 6%. Atomic force microscopy (AFM) was also used to evaluate the roughness of the coatings, which was expressed in terms of average roughness (Ra). The corrosion behavior was studied by potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS), and Mott–Schottky analysis (MSA). SEM images suggested that both GO and rGO + SEBS create uniform coatings on the substrate. The measured Ra was 25 ± 3 nm for the bare NiTi, 24 ± 3 nm for the GO coated NiTi, and 8 ± 2 nm for the rGO + SEBS coated NiTi. Both coatings presented the capacity of following several superelastic cycles, maintaining their morphological integrity. PP and EIS showed that only the rGO + SEBS coating results in a significant improvement in terms of corrosion resistance. Furthermore, rGO + SEBS decreased the oxygen vacancies in the passive film when compared with the bare NiTi and GO coating.

评估了超弹性加载循环下的机械响应和应用于 NiTi 合金的两种石墨烯基涂层的腐蚀防护能力。通过浸涂将氧化石墨烯（GO）和掺入苯乙烯-乙烯-丁烯-苯乙烯（SEBS）嵌段共聚物中的还原氧化石墨烯（rGO）复合材料沉积在基材上。在高达 6% 的单轴加载循环前后，通过扫描电子显微镜 (SEM) 对涂层的形态进行了表征。原子力显微镜 (AFM) 也用于评估涂层的粗糙度，以平均粗糙度 (Ra) 表示。通过动电位极化 (PP)、电化学阻抗谱 (EIS) 和莫特-肖特基分析 (MSA) 研究腐蚀行为。SEM 图像表明 GO 和 rGO + SEBS 在基材上产生均匀的涂层。对于裸 NiTi，测得的 Ra 为 25 ± 3 nm，对于 GO 涂层 NiTi 为 24 ± 3 nm，对于 rGO + SEBS 涂层 NiTi 为 8 ± 2 nm。两种涂层都具有遵循几个超弹性循环的能力，并保持其形态完整性。PP 和 EIS 表明，只有 rGO + SEBS 涂层在耐腐蚀性方面有显着提高。此外，与裸镍钛和 GO 涂层相比，rGO + SEBS 降低了钝化膜中的氧空位。保持它们的形态完整性。PP 和 EIS 表明，只有 rGO + SEBS 涂层在耐腐蚀性方面有显着提高。此外，与裸镍钛和 GO 涂层相比，rGO + SEBS 降低了钝化膜中的氧空位。保持它们的形态完整性。PP 和 EIS 表明，只有 rGO + SEBS 涂层在耐腐蚀性方面有显着提高。此外，与裸镍钛和 GO 涂层相比，rGO + SEBS 降低了钝化膜中的氧空位。