共查询到18条相似文献,搜索用时 138 毫秒
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微生物粘膜对海洋大型污损生物附着的影响 总被引:2,自引:0,他引:2
研究了防污漆表面细菌粘膜的组成,并利用筛选得到的菌株制成人工细菌粘膜,考察了这些人工细菌粘膜对海洋大型污损生物附着的影响。试验结果表明,菌株制成的粘膜一些对大型海洋生物的附着有抑制作用,另一些则有促进作用,还有一些作用不十分明显。 相似文献
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细菌生物膜与海洋附着生物之间的生化作用 总被引:3,自引:1,他引:3
综述了生物附着过程中细菌生物膜与海洋附着生物之间复杂的生化作用。生物膜中有些菌株对生物附着起抑制作用,有些菌株对生物附着起促进作用。防污涂料表面的细菌生物膜对涂料的防污性能和污损生物的附着有不同程度的影响。 相似文献
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海水/金属界面间会同时产生金属腐蚀与生物附着。两者的相互作用导致金属腐蚀破坏。对实际海上平台和舰船的调查表明,污损生物对平台等海上金属构筑物可产生不同形式和不同程度的腐蚀破坏,即使在阴极保护下,也是如此。下面仅从污损生物本身分析其原因。1裸体金属由于... 相似文献
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用于船体的防污涂料一般都含有氧化亚铜。由于涂层板表面氧化亚铜所产生的电离作用故而防止了海生物在水中涂层壳体上寄生。 一种将锌或铝板固定到螺旋桨上的防污方法被用于海上的铜合金螺旋桨。假使这样的话,海生物似乎就能轻易地附着在结构表面,因为表面铜的电离作用受到抑制。但目前还没有海生物附着的报道。相反,却有一些关于过量的防蚀电流防止海生物在表面附着的报道。 从这些报道中看,仍然没有说明这些防蚀方法对海生物生长的作用。 因此,本文研究了Oshima海水中海生物在一年半时间内在两种状态下的螺旋桨材料(即固定锌或铝和材料本身)上的生长率。试验结果是:前者海生物附着很严重,后者则很轻。 相似文献
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总结了钛合金管路材料腐蚀和生物污损的研究进展,分析了钛合金管路腐蚀和生物污损的主要原因,并针对钛合金管路特点,提出了钛合金管路防腐防污措施。 相似文献
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以苯甲酸钠作为海洋污损生物的防污剂,以聚二甲基硅氧烷有机硅树脂作为海洋防附着涂料的基料,并对聚二甲基硅氧烷海洋防附着涂料进行了研究.利用扫描电镜观察添加NaB的PDMS防附着涂层的微观形貌以及测得聚二甲基硅氧烷在加入苯甲酸钠后涂层表面的静态水接触角未发生太大变化,得出结论苯甲酸钠在涂层表面未形成团聚而影响涂层的低表面能特性.采用标准曲线法,通过测定溶液的电导率,根据标准曲线,推算出苯甲酸钠的累计释放量,发现含苯甲酸钠的防附着涂层没有发生"暴释"的现象.采用GB5370-85防污漆样板浅海浸泡试验方法.将防污网片浸泡在浅海中,逐月观察网片上海洋污损生物附着种类、附着量及繁殖程度,同时与空白网片作比较.观察到涂有防附着涂层的网片被附着面积比率与对照组相比明显的降低,防污性能相当优异;而且在涂有防污涂层的网片上,几乎没有藤壶等大型污损生物的附着. 相似文献
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One method to reduce the energy consumption of industrial milk spray dryers is to recover waste heat from the exhaust dryer air. A significant challenge associated with this opportunity is the air contains a small amount of powder that may deposit on the face and surfaces of a recuperator. This paper introduces a novel lab based test that simulates powder deposition on a bank of parallel plate fins at exhaust dryer air conditions. The fin bank acts like the face of a typical finned tube row in a recuperator. The aim of this study is to look at how deposition on the front of fins is affected by the air conditions. Results show similar characteristics to other milk powder deposition studies that exhibit a dramatic increase in deposition once critical stickiness levels are reached. As powder deposits on the face of the fins, the pressure drop across the bank increases until eventually an asymptote occurs, at which point the rates of deposition and removal are similar. For very sticky conditions, deposition on the face of the fins can cause a rise in the pressure drop by as much as 65%. The pressure drop has also been successfully related to the percentage of open frontal area of the fins with and without deposition. Deposition inside and at the rear of the fin bank was found to be minimal. 相似文献
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扭曲扁管冷凝器强化传热及污垢特性实验研究 总被引:1,自引:0,他引:1
为了研究扭曲扁管在冷凝器中的运行特性,采用实验研究方法对扭曲扁管与普通直管的传热、流动阻力和污垢特性进行了研究.实验采用φ25×2.5的普通直管和由同种直管制成的扭曲扁管,扭曲扁管导程分别为120mm、150mm、180mm.实验表明,导程减小,阻力系数增大,扭曲扁管流动阻力系数约为直管的1.75~2倍.扭曲扁管的传热系数在洁净状态下约为直管1.2~2.3倍,在污垢状态下,约为直管1.8~2.1倍.随着Re增大,污垢热阻减小,但螺旋扁管的减小速度比直管更大,在Re=3000情况下螺旋扁管的污垢热阻与直管相近,当Re》6000时,螺旋扁管污垢热阻约为光管的0.16~0.42倍.通过分析,得出了污垢状态下实验扭曲扁管的最佳工作区. 相似文献
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It is known that the adhesive strength of metallic films on polymer substrates often changes in the course of time. To study this effect in more detail, the adhesion energy of sputtered and galvanically strengthened copper coatings on acrylonitrile-butadiene-styrene polymer substrate was determined as a function of storage time. The adhesion energy is initially only about 6 J/m2, because of water introduced to the interface during the galvanic deposition process. Within about 48 hours most of the water disappears leading to a relatively rapid increase of the adhesion energy to a value of approximately 23 J/m2. Thereafter, an increase, albeit at a lower rate, was still measured and at the end of the study (1008 hours) adhesion energy of about 54 J/m2 was found. The increase during the latter period is attributed to structural rearrangements taking place near the interface. 相似文献
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印染废水由于其高色度、高COD、高盐度和可生化性差的特点,成为废水处理领域的一大难题。与常规方法相比,膜法废水处理技术由于其高效、节能、无二次污染等优点而倍受关注。本文主要结合印染废水和膜法废水处理技术的特点,综述了超滤和纳滤等功能膜材料在印染废水深度处理中的应用。胶束强化超滤以及超滤与传统工艺联用的方法有效解决了单独超滤对小分子染料去除率不高的问题,而纳滤不仅对染料脱色效果较好,而且可达到回收染料和回用水的目的,因而具有极其广阔的应用前景。文章还针对废水处理过程中存在的膜污染问题,分析了相应的预防措施。 相似文献
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Adhesion of diamond coatings on cemented carbides 总被引:21,自引:0,他引:21
M. Nesldek K. Vandierendonck C. Quaeyhaegens M. Kerkhofs L. M. Stals 《Thin solid films》1995,270(1-2):184-188
Precise quantification of the adhesion of diamond coatings on cemented carbide (WC-Co) inserts is important for industrial applications. Adhesion is strongly influenced by the surface roughness, surface reactivity, catalytic effect of Co during diamond chemical vapour deposition (CVD) and by stresses developed in the film and at the bonding interface.
In this work we investigated the adhesion of diamond coatings on WC-Co by using Rockwell-C indentation. Various surface modifications were studied: Co leaching; replacement of Co by Cu; WC-Co decarburization and deposition of Ti intermediate layer prior to diamond CVD. Turning tests with diamond coated inserts for machining of Al alloy were carried out. 相似文献