H_2S/CO_2共存环境下管道内腐蚀研究进展

Preparation and Performance of Cobalt-Nickel Double Hydroxide Nanowire-Decorated Graphene Composite

研究了H2S/CO2共存环境下管道内腐蚀过程中的影响因素,如H2S/CO2比率、含水率、温度、流速等。其中最为重要的就是H2S/CO2比率,H2S/CO2比率不同生成的腐蚀产物就不同,相应的对基体的保护程度也就不同。而含水率则是通过影响液体的乳化形式来影响管道腐蚀速率,当液体由油包水型乳状液变为水包油型乳状液时管道的腐蚀速率大大增加。温度一方面通过影响保护膜的生成另一方面是改变反应的活化能,从而进一步影响腐蚀速率。然而两者共存下的腐蚀研究仍停留在实验的基础上,还未形成十分系统、完善的理论体系。最后介绍了油气集输系统中的几种防腐措施,特别是耐腐蚀钢在防腐蚀领域的应用,值得注意的是铬元素的加入大大增强了钢的耐腐蚀能力,但发生点蚀的风险也大大增加。

Currently, seeking excellent electrode materials for energy storage and conversion is a hot re- searching topic. Cobalt and nickel double metal hydroxide nanowire-decorated electrochemical exfoliated graphene composite （CoNi-DHNW/EG） was prepared through hydrothermal self assemble strategy using electrochemical exfoliated graphene as support, and cobalt nickel nitrate salts as raw materials. X-ray dif- fraction （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM） were used to characterize the structure and morphology of the composites. The results show that CoNi-DHNW is well distributed on graphene sheets with a diameter of 20 nm. The electric storage performance of CoNi- DHNW/EG was then explored. It is found that when the mass ratio of the CoNi double hydroxides to EG is 7：3, the molar ratio of Co（OH）2 to Ni（OH）2 is 2： 1, hydrothermal temperature is 120℃ ,Co0.66Ni0.33 DHNW/EG exhibits the optimum specific capacitance up to 225F·g-1. The composite may be a promising material for the storage and conversion due to its facile fabrication process, low-cost raw materials, andenvironmental friendliness.