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Effects of curing temperature and addition of functionalized graphene oxide on corrosion barrier performance of phenol furfural polymer-amino phenolic resin composite
Progress in Organic Coatings ( IF 6.5 ) Pub Date : 2024-01-05 , DOI: 10.1016/j.porgcoat.2023.108164
Malavalli Chidanandakumar Hithesh , Kikkeri Narasimha Shetty Mohana , Yadavanahalli Mahalingaiah Harsha , Muralidharan Sreelakshmi , Ambale Murthy Madhusudhana , Mysore Chandru Sunil Kumar

Phenol furfural polymer (PFP) blended amino phenolic resin (APR) and functionalized graphene oxide (FGO) dispersed PFP/APR polymer composite coatings were fabricated and evaluated their barrier performance on mild steel (MS) corrosion at different curing temperatures without using any conventional hardeners. The PFP was synthesized by condensation polymerization and blended with the prepared APR to get PFP/APR polymer composite. The GO was functionalized with 4-(trifluoromethyl) benzohydrazide (TFB) and dissipated in PFP/APR composite matrix. The synthesized materials were characterized by FT-IR, Raman, XRD, XPS, EDS, SEM and TEM techniques. The thermal stability of GO and FGO was analyzed using TGA. The fabricated composite materials were coated on MS surface and their surface morphology, anti-corrosion potential and hydrophobic character were evaluated by SEM, optical images, electrochemical impedance spectroscopy (EIS), salt spray analysis (SSA) and contact angle measurements (CA). At 70 °C curing temperature, the PFP/APR coating showed maximum coating resistance (Rc) of 1.39 × 105 Ω cm2 and charge transfer resistance (Rct) of 2.63 × 105 Ω cm2 on 60th day of immersion in 3.5 wt% NaCl solution. Addition of 0.2 wt% FGO into PFP/APR matrix reduced the ideal curing temperature to 50 °C and exhibited an admirable barrier performance even after 90 days of immersion in saline medium with a reliable Rc and Rct values of 1.24 × 105 Ω cm2, 1.93 × 105 Ω cm2 respectively, and coating capacitance (Qc) in the range of 10−9 F/cm2. The cross linking of resin and blockade of defects by nanofiller make the material highly durable and superior in extensive corrosive environment.



中文翻译:

固化温度和功能化氧化石墨烯添加量对苯酚糠醛聚合物-氨基酚醛树脂复合材料缓蚀性能的影响

制备了苯酚糠醛聚合物(PFP)共混的氨基酚醛树脂(APR)和功能化氧化石墨烯(FGO)分散的PFP/APR聚合物复合涂料,并评估了其在不同固化温度下对低碳钢(MS)腐蚀的阻隔性能,且不使用任何传统硬化剂。通过缩聚法合成PFP,并与制备的APR共混得到PFP/APR聚合物复合材料。GO 用 4-(三氟甲基)苯甲酰肼 (TFB) 进行功能化,并消散在 PFP/APR 复合基质中。通过FT-IR、Raman、 XRD、 XPS 、EDS 、SEM和TEM技术对合成的材料进行了表征。使用TGA 分析了GO 和FGO 的热稳定性。将制备的复合材料涂覆在MS表面,并通过SEM、光学图像、电化学阻抗谱(EIS)、盐雾分析(SSA)和接触角测量(CA)评估其表面形貌、防腐潜力和疏水特性。在 70 °C 固化温度下,PFP/APR 涂层在浸泡第 60 天时表现出最大涂层电阻 (R c ) 为 1.39 × 10 5  Ω cm 2,电荷转移电阻 (R ct ) 为 2.63 × 10 5  Ω cm 2 。 3.5 wt% 氯化钠溶液。在 PFP/APR 基质中添加 0.2 wt% FGO 将理想固化温度降低至 50 °C,即使在盐水介质中浸泡 90 天后仍表现出令人赞叹的阻隔性能,可靠的 R c和 R ct值为 1.24 × 10 5  Ω cm 2、1.93×10 5  Ω cm 2,涂层电容(Q c )在10 -9  F/cm 2范围内。树脂的交联和纳米填料对缺陷的封锁使该材料在广泛的腐蚀环境中具有高度耐用性和优越性。

更新日期:2024-01-07
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