Corrosion behavior of ferritic ODS steel prepared by adding YH_2 nanoparticles in supercritical water at 600 °C

The corrosion behavior of the ferritic oxide dispersion strengthened(ODS)steel(14Cr-3Al-2W-0.1Ti)prepared by adding YH_2nanoparticles(NPs)was investigated in supercritical water(SCW)at 600°C for 1500 h.The mass gain of the ODS steel(215.5 mg/dm~2)was lower than that of SUS430 steel(357.2 mg/dm~2).A dual oxide layer generated on the surface of ODS steel after corrosion in SCW.The outer layer was composed of Fe_2O_3and Fe_3O_4,while the inner layer composed of the spinel-type FeCr_2O_4together with Al_2O_3.The generation of Y_2Ti_2O_7NPs in the ODS steel by adding YH_2NPs prohibits the formation of Y-Al-O particles and leaves more Al available to form a continuous protective oxide scale to improve the corrosion resistance.Moreover,the Y_2Ti_2O_7NPs act as efficient barriers to suppress the outward diffusion of metal atoms.This novel ODS steel shows potential applications in supercritical water.     

改性木素的缓蚀性能研究

木质素经Ｍａｎｎｉｃｈ反应改性,合成了一类含磷高分子缓蚀剂。在０．５２Ｎ硫酸溶液中借助失重法和电化学方法进行了缓蚀效果的测定。当缓蚀剂用量２０ｍｇ／ｌ时,对Ａ３风的缓蚀率达８７％。该化合物为阳极型缓蚀剂。     

油酸系阴离子型缓蚀剂性能的研究

在实验室合成含有磷酸酯基的油酸系阴离子型缓蚀剂,用失重法研究了其在标准溶液中的缓蚀作用,发现具有优良的缓蚀性能。其水溶液喷涂在金属表面,干后形成一层保护薄膜,防潮防锈,并能抑制已锈蚀金属继续生锈。     

多功能高效化学清洗缓蚀剂的研制

合成了一种可适用于多种酸、多种金属材料的化学清洗缓蚀剂 ,研究了缓蚀剂添加量、酸浸时间、温度等因素对缓蚀性能的影响     

环保型缓蚀剂的研制及性能研究

介绍了聚天冬氨酸的制备方法,研制了一种适用于工业循环冷却水的环保型缓蚀剂,该 缓蚀剂主要有聚天冬氨酸、钼酸钠等复合而成,具有用量低、不含亚硝酸盐而缓蚀性好的优点。 讨论了影响其缓蚀性能的一些因素,并提出了该药剂的应用范围。     

从防空洞中走出来的“时代女性”——论茅盾小说《腐蚀》中的赵惠明

在中国现代文学"女特务"形象群中,赵惠明是很独特的一位。赵惠明形象的独特,首先取决于作品的主题。作者的人性观和人道主义立场也在很大程度上影响到了赵惠明形象的塑造。作者的悲剧艺术使赵惠明这一艺术形象具有较大的感染力。但由于作者没有赋予赵惠明强大的精神内核,在作品中人性就难以呈现高层次的纠葛和对抗。与类似题材的拉夫列尼约夫的《第四十一个》等作品相比,《腐蚀》不仅失之平淡和单薄,同时也失却了震撼人心的力量。     

大面积Ni25合金梯度涂层的激光熔覆

激光熔覆是一种有效的金属表面改性方法。本文采用在45号钢上熔覆一层Ni25合金涂层。并对获得的熔覆层进行组织、硬度、耐磨和腐蚀性能的研究。结果表明:激光熔覆后的熔覆层表面的硬度、耐磨性和耐蚀性较基体有很大的提高。     

化工设备设计中耐盐酸腐蚀材料的选择

本文认为在化工设备设计中耐盐酸腐蚀材料的选择应从耐腐蚀性、工作条件、机械性能、加工性能、供货周职、成本等几方面综合考虑。并对耐盐酸腐蚀材料的类型和现状进行了有益的探讨。     

The enhanced corrosion resistance of UMAO coatings on Mg by silane treatment

The surface silanization was carried out on ultrasonic micro-arc oxidation(UMAO) coatings on pure magnesium using KH550 as silane coupling agent(SCA). The surface morphology, chemical bonds and corrosion resistance of the silane films were investigated by scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FTIR) and electrochemical workstation, respectively. The results showed that hybrid coatings were successfully prepared on pure magnesium by UMAO-Na OH(1 mol/L, 2 mol/L, 3 mol/L)-SCA processing. The organic films with Si–O–Mg bonds are helpful for the reduction of the pores in UMAO coatings. The pores decreased with increasing Na OH concentration. Compared with single UMAO treatment, the corrosion potentials(Ecorr) of magnesium plates with UMAO-Na OH(1 mol/L,2 mol/L, 3 mol/L)-SCA treatment increased by 29 m V, 53 m V and 75 m V, respectively, meanwhile the corrosion current density(Icorr) reduced one to two orders of magnitude. It indicated that the corrosion resistance of the coatings was improved by silane treatment.     

Effects of solidifi cation cooling rate on the corrosion resistance of Mg – Zn–Ca alloy

This study was carried out to investigate the effect of solidification cooling rate on the corrosion resistance of an Mg–Zn–Ca alloy developed for biomedical applications. A wedge shaped copper mould was used to obtain different solidification cooling rates. Electrochemical and immersion tests were employed to measure the corrosion resistance of Mg–Zn–Ca alloy. It was found that increasing cooling rate resulted in a significant improvement in the corrosion resistance of the Mg–Zn–Ca alloy. The findings were explained in terms of solidification behaviour in association with the change in solubility of the alloying elements, microstructural homogeneity and refinement and chemical homogeneity as well as the increased cooling rates.