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Heavy paint coating loss and localized corrosion of the Al alloy hull occur red after less than a year's service of a ship at sea.Examination and analysis showed that the Mg-basic sacrificial anodes originally used for cathodic protection were not suitable as the resulting -1.3V-plus (vs Ag/AgCl) protection potential for the hull was too negative for the purpose .A new protection system was designed in which the protection current densities were 15mA/m2 for the hull and 350mA/m2 for the propeller - The hull protection potential under actual condition at sea was between -920mV and - 1100mV (Ag/AgCl) and the protection efficiency was over 90% . The protection areas were calculated by using the formulas A=1.8×LBP×D+ BC× LB×B for the hull and As=2Aas for the propeller. 相似文献
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三突蛀木水虱 Limnoria tripunctata Menzies (图1)属甲壳纲、等足目、扇肢亚目、蛀木水虱科(Limnoridae),分布于太平洋、大西洋和印度洋,在我国是一种常见的蛀木害虫。
三突蛀木水虱的体型较小,在木材表面凿木穴居,一般不易见到。它是海洋中木船、网樯、码头桩柱、海港护木和养殖池闸门等木质结构物的破坏者之一,能造成巨大的经济损失。
为了有效地防除蛀木水虱,需要对它的生态学和生物学进行详细的研究。本文根据作者1983-1984年在青岛港对三突蛀木水虱自然种群进行为时一周年的随机取样调查分析,和连续几年在实验室培养实验观察的结果,对其繁殖习性探讨、报道如下。 相似文献
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细菌性鱼病对鱼类养殖业危害广、威胁严重。以淡水鱼类和梭鱼等为主要危害对象的细菌出血性败血病危及我国养鱼水域,给渔业生产造成了巨大的损失。目前,鲤鱼的出血性败血症已得到有效控制,海水鱼类如牙鲆、真鲷、梭鱼等的出血性败血症正在研究之中。为防治该病的蔓延,我们于1995年进行了梭鱼出血性败血病病原菌研究,从患病梭鱼病灶处分离到该病的病原菌为嗜水气单胞菌。在此基础上,我们又对防治梭鱼出血性败血病药物的药效进行了比较研究,根据药敏试验结果,筛选出4种安全、有效、价廉的鱼用口服药物氟哌酸、鱼血散、氯霉素和磺胺+TMP。本研究用氟哌酸对梭鱼细菌出血性败血病进行了防治,疗效显著。 相似文献
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