Ni-P-MgO(CuO)纳米、微米复合化学镀层的制备和性质     

马美华  李小华  单云 《南京晓庄学院学报》2006,22(4):37-40

为了进一步研究化学镀镍磷复合镀层的性能,在研究了镍磷化学复合镀新配方的基础上,在A3钢片表面分别制备了纳米和微米复合材料镀层N i-P-MgO(CuO).用称重法测定厚度;通过10%NaC l溶液测定其耐腐蚀性;GB5935 86标准贴滤纸法测镀层的孔隙率;MH-3硬度仪测定其硬度.结果表明:在最佳施镀条件下,可得到耐磨性、硬度强于A3钢片、N i-P镀层和N i-P-MgO(CuO)纳米复合镀层的微米复合化学镀层,和光亮致密耐腐蚀性强于A3钢片、和N i-P-MgO(CuO)微米复合镀层,与N i-P镀层相当的N i-P-MgO(CuO)纳米复合镀层.  相似文献   

壳聚糖涂膜对芒果的保鲜效应   总被引：5，自引：0，他引：5  

王伟洲 《宁波职业技术学院学报》2006,10(2):105-107

探讨了不同浓度壳聚糖涂膜剂对芒果生化指标和保鲜效果的影响。结果表明:2%浓度的壳聚糖涂膜剂对芒果呼吸作用有最好的抑制效果,总酸度和酶活性变化最小,腐烂率最低,具有最好的保鲜效果。  相似文献   

高斯光束辐照下光学薄膜基底温度场有限元分析   总被引：2，自引：1，他引：1  

江腾蛟 《嘉应学院学报》2008,26(3):38-41

基于热传导方程,利用有限元分析方法,利用MSC．Marc有限元软件建立了激光辐照下光学薄膜基底温度场的三维模型,研究了光学薄膜基底在高斯光束辐照下的温度场分布,并进行了分析。  相似文献   

Tribology Performance and Adhesive Strength Evaluation of TiA1SiN Coating     

JIANG Feng  XIE Hong  RONG Yiming  YAN Lan 《天津大学学报(英文版)》2011,17(4)

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反应等离子熔覆原位合成TiC增强涂层     

王立梅 《实验室研究与探索》2011,30(11)

TiC增强涂层以钛铁粉、铁粉、铬粉和碳的前驱体(蔗糖)等为原料,通过前驱体碳化复合技术制备了Fe-Cr-Ti-C等离子熔覆复合粉末,并通过等离子熔覆技术在Q235钢表面成功原位合成.采用SEM、XRD和EDS对涂层的相组成和显微组织结构进行了分析,并在室温干滑动磨损条件下测试了该涂层的耐磨性能.结果表明,等离子熔覆涂层由原位合成的TiC相和(Cr,Fe)7C3共晶相与奥氏体相构成,与基材完全冶金结合.涂层中碳化物TiC呈现梯度分布,并且涂层的熔合区和中部区域TiC颗粒形状大多呈现粒状,涂层的表层区域部分TiC颗粒呈现树枝状.涂层的硬度从表面到熔合区相差不大,平均显微硬度约是HV02750,是基体金属的3.2倍.涂层磨损质量约是基体金属的1/12,具有良好的耐磨性能.  相似文献   

Fast evaluation of degradation degree of organic coatings by analyzing electrochemical impedance spectroscopy data   总被引：3，自引：0，他引：3  

夏大海  宋诗哲  王吉会  毕慧超  韩哲文 《天津大学学报(英文版)》2012,18(1):15-20

The degradation coefficient is proposed to evaluate the degradation degree of organic coatings by directly analyzing the Bode plots of the electrochemical impedance spectroscopy (EIS) data.This paper investigated the degradation of phenolic epoxy coating/tinplate system by EIS and the degradation coefficient value,which correlates well with the results of breakpoint frequency and variation of phase angle at 10 Hz.Furthermore,the degradation process was confirmed by scanning electron microscope (SEM) and scanning probe microscopy (SPM).It is concluded that degradation coefficient can be used for the fast evaluation of degradation degree of organic coatings in practical applications.  相似文献   

Water-soluble UV curable urethane methyl acrylate coating: preparation and properties     

魏燕彦  罗英武  李宝芳  李伯耿 《浙江大学学报(A卷英文版)》2004,5(8):906-911

Two kinds of water-soluble and ultraviolet (UV) curable oligomers were synthesized and characterized. The oligomers were evaluated as resins for water-based UV curable coating. The rheology of the two oligomers' aqueous solutions was investigated in terms of solid fraction, pH dependence, and temperature dependence. The solutions were found to be Newtonian fluid showing rather low viscosity even at high solid fraction of 0.55. The drying process of the coatings and the properties of the cured coatings were studied by comparing them with water-dispersed UV-curable polyurethane methyl acrylate. It was evident that the water-soluble coating dried more slowly; and that the overall properties were inferior to those of the water-dispersed coating.  相似文献   

Influence of hydroxypropyl methylcellulose edible coating on fresh-keeping and storability of tomato     

庄荣玉  黄耀文 《浙江大学学报(A卷英文版)》2003,4(1):109-113

The effect of application of cellulose-based edible coating, hydroxypropyl methylcellulose (HPMC) to mature-green tomatoes on the firmness and color was investigated. Tomatoes were stored at 20°C for up to 18 days. Firmness decreased as storage time increased in all treatments. However, application of HPMC edible coating delayed softening of tomatoes during 18 days of storage at 20°C. At days 7, 13 and 18, the firmness of tomatoes coated with HPMC was significantly (P≦0.05) greater than the firmness of uncoated tomatoes. The study also confirmed that HPMC coatings could significantly (P≦0.05) delay the changes in color of tomatoes stored at 20°C. The ripening of tomatoes from the pink stage to the red stage was successfully retarded. HPMC coating could extend the shelf life of fresh tomatoes. The retardation of the rate of loss of firmness could reduce the economic loss that would result from spoilage by mechanical injury during transportation of tomatoes. Project partly supported by the Centers for Disease Control and Prevention, U.S. Public Health Service  相似文献   

环保型耐水内墙粉末涂料的初步研制     

周如金  刘宝生  李德豪  齐凯琴 《茂名学院学报》2002,12(4):18-20

以可再生资源研制环保型内墙粉末涂料是涂料绿色化发展的一个方面，该文以木薯淀粉为原料经醚化，氧化，复合交联等多步变性反应，制得天然高分子胶粉；然后以胶粉为成膜剂对环保型内墙粉末涂料的配方进行了初步研究。经试用及性能测试表明，研制的环保型耐水内墙粉末涂料的综合性能优于106涂料。  相似文献   

超细莫来石在钢结构防火涂料中的应用     

赵小颖  傅晓波 《金华职业技术学院学报》2007,7(4):19-23

本文讨论了超细莫来石在水中的分散得到均匀稳定的水分散液,并将其添加到钢结构防火涂料中,采用高温燃烧、热重分析和微观分析法,考察超细莫来石添加量对钢结构防火涂料性能的影响.  相似文献