A promising novel composite coating based on compound pigment of zinc phosphate and polypyrrole (PPy) functionalized graphene (ZGP) was reported for carbon steel in 3.5 wt% NaCl solution. Two ratios of PPy functionalized graphene oxide (GO-PPy) nanocomposites were prepared by in-situ polymerization of pyrrol (Py) on the surface of graphene oxide (GO). PPy film deposited on the surface of graphene oxide guaranteed excellent dispersion in the coating owing to hydrophilic groups. Embedding a small amount of ZGP-2 composite pigment (m_Py/m_GO=2:1) into the waterborne epoxy coating significantly improved corrosion protection of the prepared composite coating. The corrosion protection mechanism of the desirable coating was attributed to the synergistic protection of impermeable GO-PPy nanosheets and passivation function of zinc phosphate, which was proved by the identification of corrosion products. Therefore, this work may provide a new direction for further study on compound pigments composed of functional graphene nanomaterials and inorganic salt inhibitors.

据报道，碳钢在3.5 wt％的NaCl溶液中，基于磷酸锌和聚吡咯（PPy）官能化石墨烯（ZGP）的复合颜料的一种有前途的新型复合涂层。通过吡咯（Py）在氧化石墨烯（GO）表面上原位聚合，制备了两种比例的PPy官能化氧化石墨烯（GO-PPy）纳米复合材料。由于亲水基团的缘故，沉积在氧化石墨烯表面的PPy膜保证了在涂料中的优异分散性。嵌入少量ZGP-2复合颜料（m _Py / m _GO= 2：1）显着提高了制备的复合涂料的水性防腐涂料的防腐性能。理想涂层的腐蚀防护机理归因于不可渗透的GO-PPy纳米片的协同保护和磷酸锌的钝化功能，这通过腐蚀产物的鉴定得以证明。因此，这项工作可能为进一步研究由功能性石墨烯纳米材料和无机盐抑制剂组成的复合颜料提供新的方向。