Novel isoxazolium cationic Schiff base compounds as corrosion inhibitors for carbon steel in hydrochloric acid

The corrosion of carbon steel in 0.5 M HCl at 25 °C was investigated in the presence of two synthesized quaternary isoxazolium Schiff base series using gravimetric, polarization and electrochemical impedance measurements. The measurements showed a gradual increase in the inhibitors efficiencies by increasing the dose and hydrophobic chain length. The calculated activation energies proposed that the inhibitor molecules are adsorbed physically onto the metal surface. Surface activity-inhibition tendency relation showed the gradual increase of the inhibition efficiency by increasing the hydrophobic chain length.     

Responsive behaviour of galvanic anodes in concrete and the basis for its utilisation

In this study, a unique concrete specimen was used to analyse the response of embedded sacrificial zinc and steel anodes to rainfall and fluctuations in temperature. Current from the zinc and steel anodes increased when the environment was aggressive, showing that the required protection current depends on the present level of corrosion risk. A basis for using the ‘responsive behaviour’ of galvanic anodes is provided by the protective effects of pit re-alkalisation and pH maintenance. By contrast, protection based on achieving adequate polarisation inhibits the use of responsive behaviour and galvanic anodes might only deliver adequate polarisation in aggressive environments.     

锆合金的腐蚀性研究

在不同保护温度下采用钨极氩弧焊＋高纯氩气作为保护气体的焊接方法将锆R60702板材连接起来,并利用电化学腐蚀手段和扫描电镜的形貌观察等方法,研究R60702在醋酸中的腐蚀行为。试验结果表明：在5mol／L的醋酸溶液中,接头的腐蚀类型以点蚀为主。保护温度在800℃时,锆R60702的耐腐蚀性能严重下降,而保护温度在315℃和400℃下时,其耐腐蚀性能与严格保护下没有很明显的下降。     

一种新的PCB无氰化学沉金工艺

介绍了一种新的不含游离氛的无氰化学沉金工艺,并从工艺特.s、沉金效果、产品品质和环保处理等方面将该无氰沉金工艺与传统的有氛化学沉金工艺进行了对比分析,分析表明:该无氰沉金工艺的金缸溶液寿命更长,沉积均匀性更好,沉积速率可控,有利于控制金厚和降低镀金的材料成本;产品的品质有保障,过程更环保,可望替代传统的有氰工艺.     

城市配气系统中牺牲阳极法的设计与施工

阐述了对城市燃气管网威胁最大的电化学腐蚀问题以及牺牲阳极保护法的重要性,并从设计、施工和使用环节详细介绍了牺牲阳极法阴极保护在城市配气系统中的应用.     

不锈钢管凝汽器不同清洗方式的比较分枥

分析了其结垢原因及不同清洗方式的特点,根据结垢成分及垢的厚度,给出了选择合适的清洗方法的建议。     

有机锡热稳定剂的毒性及其控制与防护

综述了有机锡热稳定剂的毒性;分析了有机锡热稳定剂的毒性及其毒性控制原理;并简述了有机锡热稳定剂的应用防护以及因不当使用而中毒所要采取的有利措施;旨在确保人们能正确认识有机锡热稳定剂的毒性以及防护,为有机锡热稳定剂的安全生产与应用提供理论依据。     

节能型芳烃抽提回收塔真空系统

芳烃抽提装置回收塔蒸汽抽真空系统存在能源浪费、环境污染等一些问题,结合真空技术发展趋势,对其进行改造具有很好的经济和环境效益。     

片状锌粉在富锌涂料领域的应用及其技术发展趋势

介绍了国内外鳞片基富锌涂料的主要技术特点和发展状况:包括鳞片锌基粉末涂料、鳞片基水生无机富锌涂料、鳞片基醇溶无机富锌涂料和球片结合基富锌涂料.认为片锌基粉末涂料、片锌基水性/醇溶无机涂料及球片结合基富锌涂料等是这类涂料的发展方向.     

低碳环保型碱性镀锌自动生产线工艺设计

阐述了某军工企业无氰镀锌工艺设计秉持的原则和依据.介绍了2699型碱性镀锌智能化生产线的工艺流程,其主要包括:化学除油,除锈,阳极电解除油,浸碱液,镀锌,硝酸出光,彩色钝化或三价铬厚膜钝化,热水洗,烘干,检验,装箱.给出了各工序的溶液组成及工艺条件.从槽液带出损失及废水处理方面,比较了该工艺与高氰镀锌工艺的运行成本.实...