大洋锰结核氨浸渣制备防锈涂料及其性质

ANTICORROSIVE PAINT PREPARED BY MARINE MANGANESE NODULE TAILINGS AND ITS PROPERTIES

以大洋锰结核经氨浸工艺提取钴、镍、铜等金属后的粉末状固体残渣(氨浸渣)为颜填料、与水混合制成色浆,再与苯丙乳液和辅助原料混合,制备水性防锈涂料。色浆组成(质量分数,下同)为:氨浸渣55.15%,水42.63%,辅助原料2.22%;防锈涂料配方为:色浆60%,苯丙乳液30%,辅助原料10%。防锈涂层的抗冲击强度≥490N·cm,耐盐水性超过21d。研究表明:氨浸渣富含Fe2O3,对被保护物品具有屏蔽和物理防锈作用。氨浸渣中的Zr,Zn等元素可与受腐蚀的铁或与环境中的SO42-反应,生成惰性氧化物或难溶化合物,具有化学防腐作用。氨浸渣中的稀土元素和锰能促进漆膜分子网络交联,可缩短涂层的固化成膜时间,并提高涂膜的强度和耐水性。

A new type of water-disperse anticorrosive paint was prepared by using ammonia leaching residue which is the residues of manganese nodules after the extraction of Co, Ni, Cu by ammonia leaching process. The first step of making the water-disperse anticorrosive paint is to prepare the colored slurry by mixing ammonia leaching residues (55.15% in mass, same below) with water (42.63%) and some auxiliary materials (2.22%). The second step is mixing the colored slurry (60%) with styrene-acrylate copolymer (30%) and some auxiliary materials (10%). The results show that the resistance to impact of the coating films is equal to or more than 490 N&middotcm, and the duration for the resistance of films to saline water is more than 21 d. The results indicate that ammonia leaching residue with rich content of Fe2O3 can provide shielding and rust prevention effects on protected articles. Ammonia leaching residue with rich contents of Zr, Zn and other trace elements can react with corroded ferrite or with other corrosive materials, such as SO42-, to form indifferent oxides or undissolvable compounds, resulted in the effect of chemical anticorrosion. Rare earth elements and manganese may accelerate the formation of polymer network of coating molecules and shorten solidifying and film-forming time. In addition it may enhance strength and water resistance of the coating films.