钢铁材质浮标对ADCP水文监测系统流量测验精度的影响

针对钢铁材质浮标的ADCP水文监测系统内置罗经受船磁力影响,导致流向测验出现偏差的问题,通过2009—2011年徐六泾水文站定线比测大、中潮水文测验的实测资料,分析采用垂直于断面的方位角作为流向(流向不修正)和采用断面各垂线实测平均流向作为流向(流向修正)两种情况下钢铁材质浮标对ADCP水文监测系统流量测验精度和流量、潮量计算的影响。结果表明:无论是否修正流向,计算得到涨落潮流量、潮量以及全潮下泄潮量和走航式ADCP定线比测的实测资料相比,误差均较小,精度都很高;在流量和潮量计算时,可以对钢铁材质浮标ADCP流向不做修正。     

碳钢贮热水箱的模拟腐蚀试验及涂层耐蚀性能研究

碳钢贮热水箱长期在30～80°C温变的热水环境中工作,易受到热水及水中杂质的腐蚀。研究了不同温度下Q235钢在自来水及含100μg/mLNaCl的自来水中的腐蚀速率。对裸钢及其涂覆相同厚度的不同涂层──酚醛环氧(自制)、钛纳米聚合物和改性聚乙烯后在70°C自来水中的极化曲线进行了比较。采用动电位扫描极化曲线测量和电化学交流阻抗谱法(EIS)分别对涂覆不同涂层的Q235钢进行了耐蚀性能研究。结果表明,3种防腐涂层均具有较佳的抗热水性,耐蚀能力较强,适宜对Q235钢贮热水箱进行防护。     

带约束拉杆L形方钢管混凝土组合异形柱的受力研究

为研究对拉约束拉杆对组合柱性能的影响,针对L形组合异形柱设置不同类型的约束拉杆、不同强度材料等进行数值模拟,对比该类型下的相应试验结果,分析验证了对拉约束拉杆对L形组合异形柱的性能改善作用,得到了对拉约束在柱延性及承载力方面的积极影响效果。最后基于线性回归分析的理论计算方法表现出了和数值结果较高的一致性,建立了具有较高参考价值的带约束拉杆的组合异形柱承载力计算公式。     

Protective properties of organic phosphate-pigmented coatings on phosphated steel substrates

Investigations have been carried out on properties of coatings, differing by their pigmentation and binder, and applied on different chemical pre-treatments of the steel surface. Paints based on alkyd and alkyd-melamine binders, pigmented with zinc phosphate and modified basic zinc phosphate were applied on amorphous and crystalline phosphated steel surface and, for the comparison purpose, on degreased steel surface. The effect of the binder, the pigment and the pre-treatment of the steel surface on the protective properties of the coatings were determined by measurements of adhesion, water absorption and water permeability and by results obtained in salt spray and Prohesion tests. Coatings based on alkyd binder show a lower damage degree and good retention of adhesion in corrosion conditions, in spite of a higher water absorption and water permeability and a lower initial adhesive strength. Protective properties of coatings have been found to be highly dependent upon the substrate pre-treatment. Chemical pre-treatment of the steel substrate increases the protective properties of the system, which is particularly evident in the case of crystalline phosphating and the coating pigmented with modified basic zinc phosphate. This phenomenon can be explained by the synergism between this phosphate pigment with crystalline phosphate layer.     

耐热钢在气化炉废热锅炉中的应用

分析论证了耐热钢在气化炉废热锅炉中的最高使用温度,阐述了高温下耐热钢的安全性,并提出了防范措施。     

在役加氢反应器材料损伤分析

基于随加氢反应器运行 5a的试验试块 ,研究了加氢反应器运行 5a后筒体材料 2 .2 5Cr 1Mo钢的损伤。进行了化学成分分析、拉伸和冲击试验、脱氢和脱脆试验以及断口形貌分析。结果表明 :反应器运行 5a后筒体母材及其焊缝金属的拉伸性能未发生明显变化 ,而冲击韧性明显降低 ,且焊缝金属损伤程度较母材严重。经分析 ,材料的损伤主要是加氢反应器长期使用过程中高温回火所致     

Synergistic Influence of Poly(4-Vinylpyridine) and Potassium Iodide on Inhibition of Corrosion of Mild Steel in 1M HCl

The corrosion and inhibition behavior of mild steel in 1 M HCl in the presence of poly(4-vinylpyridine)(P4VP) and potassium iodide (KI) was investigated using weight loss measurements, potentiodynamic polarization studies and impedance measurements. The inhibition efficiency increased with increasing P4VP concentration. The inhibiting action of P4VP is considerably enhanced by the addition of potassium iodide. The adsorption of this compound either alone or in combination with iodide ions on the metal surface is found to obey Lamgmir's adsorption isotherm. The experimental results suggest that the presence of iodide ions in the solution increases the surface coverage and, therefore, indicate the joint adsorption of P4VP and iodide ions. On the other hand, it was found that the inhibiting effect of P4VP and (P4VP + KI) increased with increasing temperature of the corrosion medium. The presence of these species in the solution decreases the double layer capacitance and increases the charge transfer resistance, both derived from Nyquist plots obtained from a.c. impedance studies. The variation of charge transfer resistance with time suggests that the inhibitive action of (P4VP + KI) depends mainly on the protective inhibitor film formed on the steel surface.     

新型防锈脂的流变特性

流变特性是后张预应力钢绞筋填充用无粘结防锈脂的重要特性。本文介绍了该种防锈脂的制备及流变性的测定方法，讨论了其流变性的影响因素。     

钢丝帘线刚度的探讨

探讨结构不同破断力相同(近)、结构和单丝直径相同而单丝强度等级不同、结构相同单丝直径不同以及同一结构有无外缠丝等因素对钢丝帘线刚度的影响。通过数据对比表明,同一结构钢丝帘线单丝直径不同及有无外缠丝对钢丝帘线刚度影响最大,为保证轮胎的生产和质量,必须有效控制外缠结构钢丝帘线的刚度。     

不锈钢转化器在中小型硫酸装置上的应用前景

分析了传统碳钢转化器存在的缺点。相对于碳钢转化器，不锈钢转化器具有结构简单、安装方便、耐高温、不易漏气、维护工作量小等优点。通过碳钢转化器和不锈钢转化器结构和造价的比较，表明不锈钢转化器在中小型硫酸装置中也有良好的应用前景。