In situ Colonization of Marine Biofilms on UNS S32760 Duplex Stainless Steel Coupons in Areas with Different Water Qualities： Implications for Corrosion Potential Behavior

In the presence of biofilms, stainless steels （SS） exhibits an increase in corrosion potential, called ennoblement. In the present study, the corrosion potential （Eco,） behavior of the duplex SS UNS S32760 was recorded simultaneously with the in situ marine biofilm formation in two areas at Arraial do Cabo, Southeastern Brazil. The biofilm at Forno Harbor （an anthropogenically disturbed area） was characterized by higher relative abundances of Bacteria at day 2, followed by diatoms （especially Navicula sp.） on day 10 and dinoflagellates on day 18, whereas no clear trend was recorded at Cabo Frio Island （an undisturbed area）. The ennoblement of Ecor values was site-dependent. In a complementary laboratory assay, biofilms were removed and the Eco values registered in sterile conditions for the subsequent 10 days and corroborated in situ results. Understanding biofilms and SS interactions has important implications for materials science and engineering decisions as well as helping to fill in imnortant gaps in this knowledge.

除盐雾通风结构设计分析

设计一种除盐雾通风系统,包括一个封闭筒状的壳体,筒状壳体内过滤器由一个物理过滤层和两个化学过滤层组成;物理过滤层内设有F5或F6级的过滤器;化学过滤层内设有中性化学干燥剂;壳体两端设有进气口及出气口。气体通过过滤系统得到多层的物理及化学的综合过滤,使进入设备内部气体的湿度及含盐量低于引起电化学腐蚀的条件,从而达到通风气体除盐雾的目的,大大降低设备内部金属表面腐蚀生锈的目的。

锈蚀的风铃

女儿的困惑“妈妈,原谅我吧!”我默默喊着。手按着那快要窒息的胸膛,身体疲惫不堪地滑倒在地。是的,初三了,那感觉漆黑的日子,妈妈的温柔呵护,那充满盼望的双眸,那欲言又止的模样塞满我的大脑,仿佛要将它胀裂了。