论文部分内容阅读
在钮扣形的99%钝钛和铌基材上等离子喷涂导电性锂铁氧体而制成一种阴极保护用阳极。选择锂铁氧体是因为它在钛和铌基材上具有极好的附着力,而且具有良好的导电性、低溶解速率以及长期稳定性。描述了钛基材在氯化物溶液中的点蚀性状;最差的保护电位为9.66伏。对涂层阳极在恒电流条件下以0.2安/厘米~2的电流密度在电解槽中进行了溶解试验。利用失重测最法测定了锂铁氧体涂层阳极在两个月试验期内的溶解速率,在充气的3.5%氯化钠溶液内测定值为1～2克/安·年。未观察到对涂层的任何损害作用。钮扣形阳极经独到的设计以便于在不排除水的情况下安装在地下管线、船舶或诸如航道闸门和高架贮水槽等水中结构上。
Plasma-sprayed conductive lithium ferrite on a button-shaped, 99% titanium and niobium substrate to produce a cathodic protection anode. Lithium ferrite is chosen because of its excellent adhesion on titanium and niobium substrates, as well as good electrical conductivity, low dissolution rate, and long-term stability. Described the pitting corrosion behavior of titanium substrates in chloride solutions; the worst case protection potential was 9.66 volts. The coated anode was subjected to a dissolution test in a cell at a current density of 0.2 A / cm 2 at a constant current. The rate of dissolution of lithium ferrite coated anodes during the two-month test period was measured using the weight loss method, and was measured in an aerated 3.5% sodium chloride solution at 1-2 grams / year. No damage to the coating was observed. The button-shaped anode is uniquely designed to be installed on underground pipelines, ships or other underwater structures such as waterway gates and overhead storage tanks without excluding water.