随着时代的发展,钢由于其比较低廉的价格和可靠的性能成为了世界上被使用最多的材料之一。由于海洋环境中的含盐量、温度、微生物等一些因素,钢材被腐蚀的情况也越来越多,因此,耐海水腐蚀钢逐渐出现。本文综述了近年来降低钢材在海水中...随着时代的发展,钢由于其比较低廉的价格和可靠的性能成为了世界上被使用最多的材料之一。由于海洋环境中的含盐量、温度、微生物等一些因素,钢材被腐蚀的情况也越来越多,因此,耐海水腐蚀钢逐渐出现。本文综述了近年来降低钢材在海水中的腐蚀速率的方法,包括改变钢材元素含量、柠檬酸钝化、牺牲阳极或外加电流的阴极保护法、物理气相沉积法、化学气相沉积法、热喷涂法、电沉积法等来对钢材进行成分或者表面改性,进而达到增加钢材的耐腐蚀性的目的。最后对钢材耐腐蚀性的提高进行了总结及展望。With the development of the times, steel has become one of the most used materials in the world due to its relatively low price and reliable performance. Due to some factors such as salt content, temperature, and microorganisms in the marine environment, steel is increasingly corroded, so seawater corrosion-resistant steel is gradually emerging. In this paper, the methods to reduce the corrosion rate of steel in seawater in recent years are reviewed, including changing the element content of steel, citric acid passivation, cathodic protection method of sacrificial anode or impressed current, physical vapor deposition, chemical vapor deposition, thermal spraying, electrodeposition, etc., to modify the composition or surface of steel, so as to achieve the purpose of increasing the corrosion resistance of steel. Finally, the improvement of steel corrosion resistance is summarized and prospected.展开更多
通过添加多官能团环氧扩链剂对聚对苯二甲酸乙二酯(PET)进行扩链改性,然后用改性PET进行吹膜成型,研究了扩链剂含量对PET特性黏度、膜泡稳定性及薄膜力学性能和透明度的影响。结果表明,扩链剂的添加显著提升了PET的特性黏度;随着扩链剂...通过添加多官能团环氧扩链剂对聚对苯二甲酸乙二酯(PET)进行扩链改性,然后用改性PET进行吹膜成型,研究了扩链剂含量对PET特性黏度、膜泡稳定性及薄膜力学性能和透明度的影响。结果表明,扩链剂的添加显著提升了PET的特性黏度;随着扩链剂含量的增加,薄膜膜泡稳定性以及表面质量、最大吹胀比、拉伸强度得到显著改善,断裂伸长率呈先增大后减小的趋势。当扩链剂质量分数为0.7%时,PET的特性黏度由纯PET的0.71 d L/g上升至0.94 d L/g,最大吹胀比则由1.9提高至4.5,横纵向拉伸强度分别为61.7 MPa和64.4 MPa,横纵向断裂伸长率达到最高,分别为12%和12.45%,较扩链剂质量分数为0.2%时提高了105.5%以及125.1%,而透光率仅下降1.4%,得到了性能较优的吹塑薄膜制品。展开更多
文摘随着时代的发展,钢由于其比较低廉的价格和可靠的性能成为了世界上被使用最多的材料之一。由于海洋环境中的含盐量、温度、微生物等一些因素,钢材被腐蚀的情况也越来越多,因此,耐海水腐蚀钢逐渐出现。本文综述了近年来降低钢材在海水中的腐蚀速率的方法,包括改变钢材元素含量、柠檬酸钝化、牺牲阳极或外加电流的阴极保护法、物理气相沉积法、化学气相沉积法、热喷涂法、电沉积法等来对钢材进行成分或者表面改性,进而达到增加钢材的耐腐蚀性的目的。最后对钢材耐腐蚀性的提高进行了总结及展望。With the development of the times, steel has become one of the most used materials in the world due to its relatively low price and reliable performance. Due to some factors such as salt content, temperature, and microorganisms in the marine environment, steel is increasingly corroded, so seawater corrosion-resistant steel is gradually emerging. In this paper, the methods to reduce the corrosion rate of steel in seawater in recent years are reviewed, including changing the element content of steel, citric acid passivation, cathodic protection method of sacrificial anode or impressed current, physical vapor deposition, chemical vapor deposition, thermal spraying, electrodeposition, etc., to modify the composition or surface of steel, so as to achieve the purpose of increasing the corrosion resistance of steel. Finally, the improvement of steel corrosion resistance is summarized and prospected.
文摘通过添加多官能团环氧扩链剂对聚对苯二甲酸乙二酯(PET)进行扩链改性,然后用改性PET进行吹膜成型,研究了扩链剂含量对PET特性黏度、膜泡稳定性及薄膜力学性能和透明度的影响。结果表明,扩链剂的添加显著提升了PET的特性黏度;随着扩链剂含量的增加,薄膜膜泡稳定性以及表面质量、最大吹胀比、拉伸强度得到显著改善,断裂伸长率呈先增大后减小的趋势。当扩链剂质量分数为0.7%时,PET的特性黏度由纯PET的0.71 d L/g上升至0.94 d L/g,最大吹胀比则由1.9提高至4.5,横纵向拉伸强度分别为61.7 MPa和64.4 MPa,横纵向断裂伸长率达到最高,分别为12%和12.45%,较扩链剂质量分数为0.2%时提高了105.5%以及125.1%,而透光率仅下降1.4%,得到了性能较优的吹塑薄膜制品。
