Effect of Mo on corrosion behavior of Ni20Cr–xMo alloys in air with NaCl–KCl–CaCl2 vapor at 570°C

The effect of Mo on the corrosion behavior of Ni20Cr–xMo alloys in an oxidizing chlorine-containing atmosphere using air mixed with the salt-vapor mixture of NaCl–KCl–CaCl₂ at 570°C was investigated. The results revealed that the corrosion performance of the Ni20Cr alloys in the oxidizing chlorine atmosphere was improved by Mo addition of up to 3 wt%. The Mo-free alloy formed a potassium chromate during corrosion as a result of the reaction between the Cr₂O₃ scale and KCl vapor. The chromate formation increased the chlorine potential at the scale surface and induced the breakdown of the protective Cr₂O₃ scale, resulting in internal chromium chloride precipitates and a Cr-depleted zone. In contrast, the presence of Mo resulted in the formation of a NiO scale, which did not react with the salt vapors and, therefore, prevented the formation of chromates. The beneficial effect of Mo on the high-temperature chlorination of Ni–Cr alloys in salt-vapor-containing atmospheres was ascribed to the suppression of chlorine generation due to NiO scale formation.     

规整有机分子自聚集体对铜的高效缓蚀的研究

通过多步法合成了离子型含双苯并三氮唑环的目标分子，4，4'-{苯-1，3-二基二[(1E)-3-羰基丙-1-烯-1，3-二基]}二[2-(2H-苯并三唑-2-基)苯醇酸]二钾。在室温条件下，目标分子在3.5%（质量）NaCl/DMSO（二甲基亚枫）混合溶液 （体积比：40/60） 中能够发生分子自组装产生纳-微米级的自聚集体。通过傅里叶变换红外光谱 （FT-IR）、拉曼光谱和X射线光电子能谱 （XPS） 的表征，证实了所形成的目标分子自聚集体能够对铜表面产生强烈的化学吸附作用，在铜表面形成自组装膜。利用电化学方法测定了目标分子自聚集体吸附在铜表面形成自组装膜后，在3.5%（质量）NaCl溶液中的缓蚀性能。结果表明目标分子自聚集体在NaCl溶液中能高效地抑制铜腐蚀。     

Innovative method to produce large-area freestanding functional ceramic foils

Using thick and thin films instead of bulk functional materials presents tremendous advantages in the field of flexible electronics and component miniaturization. Here, a low-cost method to grow and release large-area, microscale thickness, freestanding, functional, ceramic foils is reported. It uses evaporation of sodium chloride to silicon wafer substrates as sacrificial layers, upon which functional lead titanate zirconate ceramic films are grown at 710?°C maximum temperature to validate the method. The freestanding, functional foils are then released by dissolution of the sacrificial sodium chloride in water and have the potential to be integrated into low-thermal stability printed circuits and flexible substrates. The optimization of the sodium chloride layer surface quality and bonding strength with the underlying wafer is achieved thanks to pre-annealing treatment.     

Preparation and electrochemical performance of uniform RuO2/Ti and RuO2‐IrO2/Ti electrode for electrolysis of NaCl solution

The electrochemical preparation of NaClO has been widely used for the production of industrial disinfectant. To reduce the cost of electrode preparation using the brushing method, this paper introduces a method for the electrodeposition for RuO₂/Ti and RuO₂‐IrO₂/Ti preparation and NaCl solution electrolysis. The deposition of Ir improves the uniformity and stability of the RuO₂/Ti electrode. The optimum preparation conditions and additive concentrations were investigated in detail through the orthogonal experiment. By adjusting the electroplating time, temperature and voltage, the electrode with a high content of available chlorine was synthesized successfully. The physicochemical properties of the as‐prepared RuO₂/Ti and RuO₂‐IrO₂/Ti were determined by XRD, SEM‐EDS, and XPS, and the electrochemical performance and lifetime of the RuO₂/Ti and RuO₂‐IrO₂/Ti was verified via an electrochemical workstation. Uniform and stable RuO₂/TiO₂ and RuO₂‐IrO₂/TiO₂ were synthesized successfully for the electrolysis of the NaCl solution.     

冷却方式和NaCl浓度对猪肉匀浆物凝胶特性的影响

目的研究3种冷却方式和不同NaCl浓度对冷鲜猪肉匀浆物凝胶特性的影响。方法以冷鲜猪肉为原料,分析测定不同冷却方式和NaCl浓度对猪肉匀浆物蛋白质溶解度、凝胶脱水率,凝胶持水力、凝胶强度和凝胶硬度的影响。结果 NaCl浓度为0.42mol/L时,常规冷却的猪肉匀浆物蛋白质溶解度为18.25mg/m L、凝胶持水力为49.66%、凝胶强度为40.65 g、硬度为52.38 g,均大于快速冷却和浸没冷却; NaCl浓度为0.60 mol/L时,快速冷却的猪肉匀浆物蛋白质溶解度为20.74mg/m L、凝胶强度72.27g、凝胶持水力为74.02%,均大于常规冷却和浸没冷却。结论在较高的NaCl浓度(0.60mol/L)下,快速冷却的猪肉匀浆物凝胶特性相对较好;在较低的NaCl浓度(0.42 mol/L)下,常规冷却的猪肉匀浆物凝胶特性相对较好。     

pH和NaCl质量浓度对发酵鱼糜中腐败菌Aeromonas veronii bv. veronii群体感应的影响

细菌通过群体感应(Quorum sensing,QS)系统来调控自身一些代谢行为,如生物膜的形成、鞭毛运动等,可引起食品腐败和食源性疾病,分析环境因素对细菌QS的影响对控制水产品质量安全具有重要意义。该研究以从发酵鱼糜中分离的腐败菌Aeromonas veronii bv.veronii为研究对象,利用生物报告菌根癌农杆菌及激光共聚焦显微镜等技术分析了pH(6.0、7.0、8.0)和Na Cl(5、10、20 g/L)对细菌N-酰基高丝氨酸内酯(N-acyl homoserine lactone,AHL)类信号分子介导的QS及代谢行为的影响。研究发现,培养基初始pH 8.0或NaCl质量浓度为20g/L时能显著降低细菌产生的AHLs活性、生物膜形成能力及泳动能力(p0.05)。由此认为,通过控制环境中的pH和Na Cl质量浓度能影响细菌合成AHLs及其QS系统的表达,并调控细菌的代谢行为。