醇酸清漆保护性的电化学加速评价

将目前一种电化学阻抗谱和负电位极化相结合的AC/DC/AC技术拓展成正电位阳极极化加速与电化学阻抗评价相结合的技术,并用醇酸清漆/碳钢体系验证了该技术确实能加速涂层/金属体系的腐蚀破坏、快速评价涂层的保护性,不仅适用于阴极保护条件下的涂层,也可用于自然腐蚀甚至被阳极极化的体系。通过实验分析了该技术测得的阻抗数据及样品表面形貌的变化,研究了其加速破坏的机理,建立了涂层加速破坏失效的物理模型。对比浸泡实验、AC/阴极DC/AC循环加速实验及AC/阳极DC/AC循环加速实验阻抗变化规律和腐蚀破坏形貌。结果表明:结合阴极极化和阳极极化将是未来获得一种既快速又合理的有机涂层性能评价技术的途径之一。国家重点研发计划(2017YFB0702100)~

钢铁表面超疏水复合涂层的制备及其耐蚀性能研究

目的在钢铁表面制备超疏水复合涂层,提高其耐蚀性能。方法利用两步法,将45#钢片放在简单的镀锌溶液中（40 g/L ZnCl2,200 g/L KCl,20 g/L HBO3）进行直流电沉积,调节电沉积时间和电流密度,在钢片表面获得具有一定结构差异的镀锌层,然后使用0.05 mol/L的硬脂酸改性得到复合涂层。测试该涂层与水的接触角,使用SEM、XRD和FT-IR等技术对它们的形貌和化学组成进行表征和分析,通过测试极化曲线评价涂层的耐蚀性能。结果随电沉积时间的延长和电流密度的增大,45#钢表面水的接触角先升高后降低。当电流密度为6 A/dm2,电沉积时间为20 min时,在钢片表面成功获得团簇颗粒状的微纳结构镀锌层,平均颗粒大小<20μm,镀层厚度为4050μm。改性之后得到具有超疏水性能的复合涂层,水的接触角达155.4?,复合涂层的自腐蚀电流密度降低了一个数量级。结论通过调节电沉积时间和电流密度可以在简单的镀锌溶液中制备得到具有微纳粗糙结构的锌镀层,经改性后获得具有超疏水性能的复合涂层。该复合涂层兼具牺牲阳极和超疏水性能,耐蚀性得到有效提高,可保护钢铁基体。国家重点研发计划(2017YFB0702100)~

钝性纯Ti在人工海水中的电化学活化行为研究

通过恒电位极化、电化学阻抗(EIS)和动电位扫描曲线,跟踪监测了TA2纯Ti在人工海水溶液中的电化学钝化与特定电位的活化过程,研究了不同海水成分对该过程的影响。结果表明,在1.6 V (SCE)附近出...国家自然科学基金(51671163)~

聚乙烯吡咯烷酮对模拟混凝土孔隙液中钢筋的缓蚀效应

应用电化学阻抗谱和极化曲线测试技术,结合扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和拉曼(Raman)光谱分析,研究了表面活性剂聚乙烯吡咯烷酮(PVP)作为缓蚀剂对钢筋的缓蚀效应和机理.结果表明,PVP对pH值为11.0,含0.5 mol/L NaCl的模拟混凝土孔隙液中的钢筋具有良好的缓蚀作用,可有效抑制钢筋的腐蚀;PVP浓度变化对钢筋腐蚀行为有显著的影响,当浓度为25 mg/L时,PVP对钢筋的缓蚀效率达到89.1%;PVP通过在钢筋表面形成吸附膜来抑制钢筋的腐蚀.国家自然科学基金(批准号:21573182,51671163,21203158,21621091,21173177)资助~

ZnSe/MoO3/TiO2复合膜的制备及其光生阴极保护效应

针对TiO2半导体不能有效吸收可见光,光电转换效率较低等问题,可通过对TiO2半导体进行修饰和改性,制备TiO2复合材料,提高其光电化学性能。因此,本工作以Ti表面制备的TiO2纳米管膜为基础,分别应用循环伏安电沉积法和脉冲电沉积法在膜表面先后沉积MoO3和ZnSe颗粒,获得具有级联能带结构的ZnSe/MoO3/TiO2纳米管复合膜,并将其应用于对403不锈钢（403SS）实施光生阴极保护。相较于纯TiO2纳米管膜,紫外-可见（UV-Vis）吸收光谱和光致发光（PL）谱测试表明,ZnSe/MoO3/TiO2复合膜的吸收边红移,在可见光区具有良好的光吸收性能,光生载流子复合得到更有效抑制。光电化学测试表明,白光照射下,处于0.5 mol·L-1 KOH溶液中的ZnSe/MoO3/TiO2复合膜的光电流密度达到了同条件下纯TiO2膜的2倍,可使与之耦连的浸泡于0.5 mol·L-1 NaCl溶液中的403SS电极电位下降470 mV,显示出良好的光生阴极保护效应。复合膜还具有一定的储能特性,在光照后又转为暗态的22.5 h内仍对403SS具有一定阴极保护作用。国家自然科学基金(21573182,51731008,51671163,21621091,J1310024)资助项目~

NiO/TiO2异质结构纳米管阵列膜对不锈钢的光生阴极保护及其储能性能（英文）

本工作通过修饰TiO2制备半导体复合膜，提高其光吸收和光电化学性能，以期应用于光生阴极保护。先采用阳极氧化法在Ti表面制备TiO2纳米管阵列膜，再应用水热处理法在膜表面沉积NiO纳米颗粒，形成具有异质结构纳米管复合膜。利用扫描电子显微镜、X-射线衍射、X-射线光电子能谱、紫外-可见吸收光谱、光致发光谱和光电化学技术对制备的纳米膜进行表征。结果表明，与纯TiO2纳米管膜比较，NiO/TiO2纳米管复合膜的光吸收扩展到可见光区。白光照射下，其在0.5 mol·L-1 KOH和1 mol·L-1 CH3OH混合液中的光电流密度达到176 μA·cm-2，是纯TiO2纳米管膜的2倍。复合膜具有良好的光生阴极保护作用，与0.5 mol·L-1 NaCl溶液中的403不锈钢耦连后，可使其电极电位下降440 mV，在光照2.5 h再转为暗态后，因具有电荷储存能力还可继续提供约15.5 h的阴极保护效应。国家自然科学基金(21573182, 51731008, 51671163, 21621091)资助项

Multiplex PCR for Detecting Transgenic Component in Foods

根据转基因农作物中最常用的花椰菜花叶病毒启动子 (CaMV 3 5S)和根癌农杆菌终止子(NOS)的序列 ,设计合成了两对不同的引物和相对应的两种荧光双链探针 (FDCP) ,分别建立了多重PCR、应用FDCP的实时荧光PCR同时检测转基因成分 3 5S启动子和NOS终止子的方法 .并利用该套方法对马铃薯、大豆、玉米、甜椒、番茄等实物样品进行了检测 ,发现 1 3份样品中有 6份检出3 5S启动子、NOS终止子 ,其余 7份样品的检测结果为阴性 .表明作者建立的多重PCR方法能有效检测出 3 5S和NOS成分 ,其中多重PCR法具有灵敏度高、特异性好的特点 ,多重荧光PCR法则更为简便、快速、准确The article is to establish a PCR method for detecting transgenic component 35S promoter derived from Cauliflower Mosaic Virus and NOS terminator derived from Agrobacterium tumefaciens simultaneously. According to the specific sequence of 35S and NOS which have been used in transgenic crops frequently, two pairs of primers and two pairs of corresponding fluorophore double chain probes(FDCP)were designed and synthesized. PCR & Fluorescence PCR(FPCR)methods were established for general screening of transgenic component 35S and NOS simultaneously with Multiplex PCR in a tube. 13 samples were tested with PCR & FPCR. The results showed that 6 samples were positive, 7 samples were negative. The methods gave a sensitive, specific, simple and accurate detection of transgenic component, and thus provided a useful tool for routine analysis of raw and processed food products.厦门市科技计划项目 (350 2Z2 0 0 1 1 0 9)资助课

Pitting Behaviors of Passivated and Trans-Passivated 304 Stainless Steel

为了进一步了解不锈钢钝化膜与过钝化膜的性质,本文对比研究了在不同电位下极化处理后304不锈钢样品的点蚀及表面膜性质,发现空白对照组样品的点蚀电位和1.1 V过钝化处理后样品的点蚀电位相近,而0.5 V钝化处理后样品的点蚀电位较高. 扫描Kelvin探针（SKP）实验结果也验证了这一现象. 扫描电子显微镜（SEM）结果显示,空白对照组样品表面只呈现一般样品抛光后形貌;0.5 V钝化处理后的样品表面被颗粒状钝化膜所覆盖,该膜层决定了样品具有较好的耐蚀性;而1.1 V过钝化处理后的样品表面出现裂缝,导致不锈钢基体继续发生严重的局部腐蚀,可能成为过钝化膜保护性变差的主要原因.In order to further understand the passivation and trans-passivation behaviors of 304 stainless steels, the samples were pretreated under different polarization potentials and their corrosion behaviors were investigated. It was found that the pitting potential of the untreated sample was the same as that of the sample treated with 1.1 V trans-passivation potential, while the pitting potential of the sample treated with 0.5 V passivation treatment was the highest. This observation was further verified by the SKP results. According to SEM observations, the surface of the untreated sample preserved a polishing morphology, while the surface of the 0.5 V passivation treated sample was covered by a passivation film decorated with small corrosion particles, performing good corrosion resistance. However, cracks appeared on the surface of the 1.1 V trans-passivation treated sample, leading to severe localized corrosion of the matrix and resulting in the deterioration of the trans-passivation film.国家自然科学基金项目资助No(51671163);国家自然科学基金项目资助No(51731008)通讯作者:宋光铃E-mail:[email protected]:SONGGuang-lingE-mail:[email protected]. 厦门大学材料学院,海洋材料腐蚀与防护中心,福建 厦门3610052. 厦门大学固体表面物理化学国家重点实验室,福建 厦门3610051. Center for Marine Materials Corrosion and Protection, College of Materials, Xiamen University, Xiamen 361005, Fujian, China2. State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, Fujian, Chin

Electrochemical Response of A Single Wire-Electrode AC Probe in 3.5wt.% NaCl

本文应用新研发的一种无参比无辅助的单丝电极交流探头技术,研究碳钢和锌金属丝电极在3.5wt.% NaCl中的电化学腐蚀规律和牺牲阳极保护行为. 通过与传统的三电极电化学交流阻抗结果的对比和分析,进一步证明了该新型探头具有简便、快速、准确、稳定的特性,可实现定量评估. 测量显示,在3.5wt.% NaCl中,碳钢的瞬时腐蚀速率及累积腐蚀失重大于锌,它们腐蚀行为的差异与表面膜的性质及变化有关. 在碳钢-锌电偶对中,锌的保护效率可达到95%以上,且随浸泡时间增加先增加后减小.In this paper, a recently developed single wire-electrode AC probe technology which does not need a reference or counter electrode was employed to investigate the electrochemical corrosion and sacrificial anode protection behaviors of steel and zinc in 3.5wt.% NaCl. With this simple, fast, reliable and stable probe, the instantaneous corrosion rate and accumulated corrosion loss of carbon steel in 3.5wt.% NaCl were measured, and the results revealed that both were greater than those of zinc. Furthermore, the observed different corrosion behaviors between carbon steel and zinc during the immersion could be caused by their different surface films. With the galvanic couple of carbon steel-zinc, the protection efficiency offered by the anode zinc was found to be above 95%, and it increased initially and then decreased with immersion time.国家自然科学基金项目（No.51671163,No.51731008）资助通讯作者:宋光铃E-mail:[email protected];[email protected]:SONGGuang-lingE-mail:[email protected];[email protected]. 厦门大学材料学院,海洋材料腐蚀与防护中心,福建 厦门 3610052. 厦门大学固体表面物理化学国家重点实验室,福建 厦门 3610051. Center for Marine Materials Corrosion and Protection, College of Materials, Xiamen University,Xiamen 361005, Fujian, China2. State Key Laboratory of Physical Chemistry of Solid Surfaces, XiamenUniversity, Xiamen 361005, Fujian, Chin