【摘要】 采用共混-喷涂-热压的方法,在316L不锈钢表面上制备了10μm厚不同导电填料含量的石墨/聚酰亚胺（G/PI）、纳米炭/聚酰亚胺（C/PI）复合涂层。通过扫描电镜（SEM）、动电位极化、粘附力测试,以及接触电阻和水接触角测量,比较了含40%～70%（质量分数）填料的两种涂层的各项物理化学性质及其对316L不锈钢耐腐蚀性能的影响。结果表明,C/PI与G/PI涂层均能有效提高316L不锈钢基板的疏水性及耐蚀性,但G/PI涂层与316L不锈钢基板的结合力更好,更适合用作316L不锈钢双极板的耐蚀涂层。在含0.5 mol/L H₂SO₄和5 mg/L F-的溶液中,40%填料含量的G/PI复合涂层的耐蚀性最好,水接触角为86.6°。当组装扭矩为4.0 N·m时,70%G/PI涂层与碳纸的接触电阻为17.24 mΩ·cm²,较316L不锈钢降低了约80.49%。更多还原

【Abstract】 A graphite/polyimide(G/PI) and a nano-carbon/polyimide(C/PI) composite coatings with a thickness of 10 μm and different contents of conductive fillers were prepared on the surface of 316 L stainless steel by blending, spraying, and hot pressing. The physical and chemical properties of the two types of coatings with 40-70 wt.% of filler and their influence on the corrosion resistance of 316 L stainless steel were examined by scanning electron microscopy(SEM), potentiodynamic polarization technique, adhesion testing, as well as contact resistance and contact angle measurement. The results showed that both C/PI and G/PI coatings effectively improved the hydrophobicity and corrosion resistance of 316 L stainless steel, but the G/PI coating had a better adhesion to the substrate. The G/PI composite coating with 40% of filler had the best corrosion resistance in a solution containing H2 SO4 0.5 mol/L and F-5 mg/L and a water contact angle of 86.6°. The contact resistance between the G/PI coating with 70% of filler and carbon paper was 17.24 mΩ·cm~2 when the assembly torque was 4.0 N·m, which was about 80.49% lower than that of 316 L stainless steel.更多还原