水陆装甲车车体锈层分析

ANALYSIS ON RUSTS OF CARBON STEEL SUBJECTEDTO 20～30 YEARS EXPOSURE INSOUTH-EAST COASTAL ATMOSPHERE

采用x射线衍射、SEM和EPMA等方法对服役 2 0年～ 3 0年水陆装甲车车体锈层进行了研究 ,研究表明 :锈层中含有Cl-,锈层主要由α -FeOOH、β -FeOOH、γ -FeOOH、γ -Fe2 O3、Fe3O4以及α -Fe等相组成 ,同时还残留有极少量的绿锈GR (I) .结合水陆装甲车的使用环境 (海水、淡水 ,干湿交替 ) ,对锈层各相的成因进行了分析 .内锈层致密 ,大蚀坑下有小蚀坑 ,锈层中包含有呈小岛状弥散分布的Fe基体 。

Iron rusts on body of amphibious vehicles after service for 20-30 years in south-east coastal atmospheres have been analyzed by means of x-ray diffraction,SEM and EPMA.It was found that the phase components of the rust were goethite,akageneite,lepidocrocite,maghemite,magnetite and alpha-iron,as well as a little of the so called green rust *(I).Chloride ion was detected in the rusts and the influence of chloride on the formation of the main iron oxides and ferric hydroxides was also analyzed.Several smaller pits lying in a larger pit and some islet-like dissipated iron particles in the rusts showed that the corrosion failure of carbon steel was due to uniform corrosion and pitting corrosion.