共查询到20条相似文献,搜索用时 187 毫秒
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钢锹作为一种常用金属材料制品,被广泛应用于农业和建筑业等行业。钢锹的生产工艺,尤其是热处理工艺的优劣决定着使用寿命的长短,因此分析钢锹在热处理过程中的腐蚀机理并找出防止腐蚀的措施,具有较大的实用价值。本文介绍了金属的腐蚀失效概念,分析了钢锹在热处理过程中的高温化学腐蚀与电化学腐蚀机理,并提出了防止腐蚀的措施。 相似文献
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文章分析了海洋腐蚀监测的特殊性,从物理法、电化学法、化学分析法,生物监测法四个大方面对海洋腐蚀监测中可利用的技术进行了讨论。除了传统方法外又介绍了一些新的技术如:场图象法、光纤传感器、全息干涉等。最后作者讨论了海洋腐蚀监测的发展趋势,作者认为鉴于计算机技术的飞速发展,因特网、数据库、专家系统、智能腐蚀监测仪等基于计算机的技术在未来的腐蚀监测中会得到广泛应用。 相似文献
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制备磺酸化物使用三氧化硫为磺化剂是通常方法 ,三氧化硫较为简便的制备方法 ,即将发烟硫酸进行加热 ,驱出三氧化硫。这一过程由于设备安装不合理 ,常常引起三氧化硫发生罐局部腐蚀 ,经测试、分析找出腐蚀原因 ,改进安装结构 ,有效地减轻腐蚀延长设备使用寿命。 相似文献
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食品机械中常见的腐蚀现象与防止方法 总被引:1,自引:0,他引:1
从理论和实践上对食品机械在使用过程中较常出现的金属材料均匀腐蚀、电偶腐蚀、磨损腐蚀和微生物腐蚀现象出现的原因、失效形式进行了较详尽的论述。并针对各种腐蚀现象 ,分别在设计、制造上及在使用食品机械时提出了相应的防止方法。 相似文献
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Chaim Mannheim Nehama Passy Aaron L. Brody 《Critical reviews in food science and nutrition》1983,17(4):371-407
Internal corrosion in food cans is characterized by metallic dissolution which is an electrochemical reaction. In lacquered cans, corrosion may also cause disruption in the continuity of the lacquer film. These reactions may cause organoleptic changes in the product, loss of vacuum, swelling, and leaking in extreme cases. In some instances the metal dissolution (i.e., lead) may give rise to toxicological problems. Therefore, these phenomena are often the limiting factor in the shelf life of canned products. Changes in color, texture, and sensoric properties of the foods, which take place simultaneously, affect the aesthetic and nutritional value of the product and thus its shelf life. These changes are often related to interactions with the container. For example, tin dissolution prevents browning and loss of ascorbic acid. Shelf life of canned foods is governed by the quality of the raw materials, the processing technology, quality of the container and storage conditions which will be reviewed in this paper. Can manufacturing technologies, mechanisms of electrochemical corrosion, methods of their measurement and prediction of shelf life will be discussed. 相似文献
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Antonela Ninčević Grassino Zorana Grabarić Aldo Pezzani Giuseppe Squitieri Katarina Berković 《Journal of the science of food and agriculture》2010,90(14):2419-2426
BACKGROUND: In this work the influence of essential onion oil (EOO) on the protection of tinplates was compared with dioctyl sebacate oil (DOS) and epoxy phenolic lacquers, which are frequently used in the food canning industry. RESULTS: When EOO as the protective layer instead of DOS oil was used, tinplate porosity, measured electrochemically (7.58 ± 1.97 µA cm?2 and 23.0 ± 1.3 µA cm?2, respectively), and iron coating mass, calculated from AAS data (1.52 ± 0.15 mg m?2 and 3.14 ± 0.42, respectively), was much lower indicating better corrosion protection. At higher storing temperature (36 °C) the addition of EOO to canned tomato purée enhanced the formation of hydrogen with time. The increasing volume fraction of H2 (from 34.0 to 90.9% for cans without nitrates, and from 33.8 to 89.2% for cans with nitrates) is an indicator that corrosion takes place. CONCLUSION: As the use of EOO improves the protection of tinplate compared with DOS oil, and is almost as effective as epoxy phenolic lacquer, the addition of EOO can be recommended due to lower cost of canned food production and enhanced organoleptic properties, but the storage temperature has to be lower then 36 °C. Copyright © 2010 Society of Chemical Industry 相似文献
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糖浆的流变特性对机械设备的腐蚀行为的研究 总被引:1,自引:0,他引:1
针对目前食品机械设备普遍存在的腐蚀问题,采用失重法研究了制糖工业中不同粘度的糖浆对机械设备常用材料碳素钢Q235的腐蚀情况,得出了糖浆粘度的对数值与腐蚀速度的定量关系表达式,结果表明,随着糖浆粘度的提高,其腐蚀速度逐渐减小。 相似文献
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本文简述了江西盐矿EV -301蒸发罐腐蚀现状 ,分析了造成腐蚀的因素 ,介绍了江西盐矿为解决腐蚀采取的措施。 相似文献
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提高钢丝镀铜层耐蚀性的探讨 总被引:1,自引:1,他引:0
阐述钢丝镀前处理、镀铜工艺参数、镀后处理等对镀层耐蚀性的影响 ,着重介绍镀铜工艺参数包括镀铜方式、镀液成分、镀液温度、镀液中杂质对镀层耐蚀性的影响 ,指出要提高铜层的耐蚀性 ,镀液中硫酸铜和硫酸的质量浓度应分别达到 80~ 10 0 g/L和 10 0~ 12 0g/L ,并适当使用添加剂。提出了提高钢丝镀铜层耐蚀性的措施 相似文献
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针对江苏油田采输卤管理处套管腐蚀的特征和现状,分析了石盐矿采卤井套管的腐蚀机理和腐蚀模拟试验的研究情况,提出了适合采输卤管理处套管防腐的技术和措施。 相似文献
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J. Raczkowski 《Holz als Roh- und Werkstoff》1980,38(6):231-234
The results of recent investigations revealed that the atmospheric corrosion (weathering) of micro-sections from spruce was dependent on the season. This was substantiated by the reduction in tensile strength parallel to the grain amounting from 30% in the micro-sections subjected to atmospheric corrosion in April to about 70% in those exposed in July. The decisive factor for the atmospheric corrosion in summer is the intensity of solar radiation, while in winter the increased amount of sulphur dioxide in the surrounding air is the main factor. 相似文献
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研究了钢芯铝绞线用钢的局部腐蚀。结果表明:该钢中添加稀土元素改善了其耐蚀性能。点蚀敏感性明显降低,点蚀电位提高50~70mV;坑孔扩展速率明显下降,在宏观阴极极化-600mV的条件下,耐蚀率提高50%~150%。 相似文献