以六水合硝酸钴[Co(NO₃)₂ ·6H₂O]中钴离子为中心金属离子,均苯三甲酸(H₃BTC)为有机配体,通过水热法合成了钴基金属有机骨架 (Co-MOF)材料,并采用扫描电子显微镜(SEM)及X 射线衍射仪(XRD)对其进行表征。将制备的Co-MOF掺杂于松香基醇酸树脂中,然后涂于Q235 低碳钢电极及马口铁片表面得到涂层试样。采用电化学测试、盐雾腐蚀试验等研究了Co-MOF的添加量对涂层防腐蚀性能的影响。结果表明:适量添加Co-MOF可以提高涂层的防腐蚀作用,但过量的Co-MOF容易引起颗粒团聚,从而降低涂层的保护作用;当松香基醇酸树脂中Co-MOF的添加量为0.2 g(质量分数约0.1 %)时,腐蚀电流密度为1.63×10^-6 A/cm²,保护效率达到99.2%,而未添加Co-MOF涂层的腐蚀电流密度为29.10×10^-6 A/cm²,保护效率只有85.4 %。

Cobalt based organic framework (Co-MOF) material was synthesized by hydrothermal method with cobalt ion in cobalt nitrate hexahydrate [Co(NO₃)₂ ·6H₂O] as the central metal ion and homophenic acid (H₃BTC) as the organic ligand. And the Co-MOF was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The prepared Co-MOF was doped in rosin-based alkyd resin, which was coated on the surfaces of Q235 mild steel electrode and tinplate to obtain coating samples. The effect of the dosage of Co-MOF on the corrosion protection of the coating was investigated by electrochemical test and salt-spray test. The results showed that proper addition of Co-MOF could increase the corrosion protection of the coating, but excessive Co-MOF was easy to cause agglomeration of particles, reducing the protective effect of the coating. When the Co-MOF dosage in the rosin-based alkyd resin was 0.2 g (about 0.1% of mass fraction), the corrosion current density was 1.63×10^-6 A/cm², and the protection efficiency reached 99.2%. The corrosion current density of the coating without Co-MOF was 29.10×10^-6 A/cm², and its protection efficiency was only 85.4 %.