Inhibition Action and Adsorption Behavior of Environment-Friendly Inhibitor Poly-Aspartate on Copper

采用电化学阻抗和极化曲线法研究了绿色缓蚀剂聚天冬氨酸(PASP)对铜在200mg·L-1的NaCl溶液中的缓蚀性能和吸附行为.结果表明,在20℃时,PASP使用的最佳浓度为15mg·L-1,缓蚀率可达到78.3%,PASP的吸附明显降低了Cl-的侵蚀,属于阳极型缓蚀剂.随着温度的升高,PASP的缓蚀性能下降.在50℃时,PASP的缓蚀率下降至40.4%.PASP的吸附行为服从Langmuir吸附等温式,是自发的、放热的过程,属于化学吸附.The inhibition action and adsorption behavior of an environment-friendly inhibitor poly-aspartate (PASP) on copper in aqueous NaCl (0.02%) solution were investigated by means of electrochemical techniques. The results indicated that the best inhibition efficiency of PASP was 78.3% with the concentration of 15 mg·L-1 at 20 ℃. The adsorption of PASP prevented Cu from being corroded and PASP was an anodic inhibitor. The inhibition efficiency of PASP decreased with the increase in solution temperature, it decreased to 40.4% at 50 ℃. The adsorption behavior of PASP followed Langmuir isotherm, it was spontaneous and exothermic, and belonged to chemical adsorption.国家自然科学基金(20406009);; 上海市教委重点项目(06ZZ67);; 上海市科委科技攻关计划(062312045);; 厦门大学固体表面物理化学国家重点实验室开放课题(200512);; 上海市重点学科(P1304)资助项

Photoelectrochemical Study on the Complex of PASP and Tungstate as Inhibitors of Cupronickel B10′s Corrosion

应用光电化学的方法研究了两种环境友好型缓蚀剂聚冬天氨酸(PASP)和钨酸钠(Na2WO4)的单一配方及其复配对白铜B10在硼砂-硼酸缓冲溶液中的缓蚀作用.研究表明,在光电流循环伏安测试中,单一的PASP与Na2WO4均能够使B10表面Cu2O膜引起的p型光电流响应增大,这说明缓蚀剂增大了Cu2O膜的厚度,使B10的腐蚀速率减小.单一的PASP与Na2WO4的最佳添加浓度分别为3和5mg·L-1,单一的Na2WO4比单一的PASP使p型光电流响应增大趋势更大.若以总浓度为5mg·L-1时对两者进行复配,当PASP与Na2WO4的质量浓度比为1∶1和1∶3时,两者复配比单一使用时的p型电流光响应都更大,B10的腐蚀更小,即缓蚀剂的效果更好.交流阻抗测试结果与光电化学测试相一致.Photoelectrochemical and AC impedance measurements were conducted to study the effects of environment-friendly inhibitors poly-aspartate(PASP), Na2WO4 and their complex on the corrosion of cupronickel B10 in a borax-buffer solution. The photoelectrochemical measurement results indicated that PASP or Na2WO4 increased the p-type photocurrent which came from the Cu2O layer on the B10 surface. It showed that the inhibitors increased the thickness of the Cu2O layer and decreased the corrosion speed. The optimal concentrations of PASP and Na2WO4 was 3 and 5 mg·L-1, respectively. Na2WO4 increased photocurrent more than mono PASP did. Combined use of PASP and Na2WO4 in a total concentration of 5 mg·L-1, when the mass ratio(PASP: Na2WO4) was 1∶1 or 1∶3, increased the photocurrent more than their individual use did. The bigger the photocurrent was, the better the inhibition efficiency was. When the mass ratio (PASP: Na2WO4) was 3∶1, the combined use increased photocurrent less than their individual use did, the inhibition effect decreased. AC impedance measurement results were well agreed to the photo-electrochemical results.国家自然科学基金(20406009);; 上海市教委重点项目(06ZZ67);; 上海市重大科技攻关计划(062312045); 厦门大学固体表面物理化学国家重点实验室开放课题(200512);; 上海市重点学科(P1304)资助项

监管与重罚:如何挽回被失信的民心?

主持人:从处罚结果来看,此次长春长生生物疫苗案件,吉林药监局收回其狂犬病疫苗药品GMP证书,停止该企业狂犬病疫苗生产及销售,暂停该企业所有产品批签发,并处以罚没款总计344.29万元。而对比美国一个疫苗产品出问题,企业会被罚得倾家荡产,同时受到监禁处罚。我国的处罚制度是否偏轻?将会带来什么后果

疫苗之痛:缺失的监管,谁该担责?

背景材料:2018年7月15日,国家药品监督管理局发布通告指出,长春长生生物冻干人用狂犬病疫苗生产存在记录造假等行为;同时,该公司生产的批号为201605014-01的\"吸附无细胞百白破联合疫苗\"经中国食品药品检定研究院检验,其疫苗有效性不符合规定。此外,武汉生物制品研究所有限责任公司生产的批号为201607050-2的百白破疫苗因分装设备短时间故障,导致待分装产品混悬液不

缺位与错位:“失灵的手”该伸向何方?

主持人:结合背景材料,请谈谈此次疫苗事件暴露了我国药品监管中存在着哪些问题?造成以上问题的根本原因是什么?朱为群:虽然外界对此次疫苗事件背后的具体监管情况缺乏信息,但有一点是肯定的,那就是监管机构是存在的,但是没有发挥作用。疫苗监管缺失的根本原因在于相关监管责任者缺乏对生命的起码敬畏,以及由此导致的监管机制的缺失和监管方式

年老化视空间注意脑机制的研究

采用"提示-目标"的视觉实验范式,通过事件相关电位(ERP)技术研究了视觉注意年老化脑机制.青年和老年被试各16名;背景由3个同心黑色圆形线条组成,提示为大、中、小不等的3个圆圈组成,刺激材料是随机选取的大写英文字母,组成3个同心圆圈.不同范围圆圈提示时,靶刺激"T"出现在相对应的圆圈,而两个干扰刺激"T"分别呈现在对侧视野的另外两个圆圈.要求被试人根据提示寻找效应圈的靶字母"T",并尽快尽准确地按键判断出现在左视野还是右视野.结果显示干扰刺激的存在导致靶刺激识别难度增加,引起P1的增强和N1的降低;随着提示等级的增大,两组反应时均逐渐延长,早期ERP成分P1与N1波幅均减小;与青年组相比,老年组反应时更长,后部P1增强、N1抑制,且额区P2成分亦受到显著抑制.研究结果与年老化的"复杂度效应"一致;所发现老年组P2成分的显著抑制,提示年老化可能导致视觉空间注意(非随意注意)的前脑区功能缺陷

Photoelectrochemical study of inhibition mechanism of PASP on copper

用光电化学方法研究了绿色水处理药剂聚天冬氨酸对铜的缓蚀作用,铜在硼酸-硼砂缓冲溶液(pH=9.2)中,表面的Cu2O膜显p-型光响应,添加适量缓蚀剂聚天冬氨酸(PASP)后,PASP吸附在铜电极表面成膜促使Cu2O膜增厚,体现在电位在负向扫描过程中Cu2O膜的p-型光电流增大。p-型光电流越大,缓蚀性能越好。当PASP浓度为3mg·L-1时,Cu2O膜的p-型光电流最大,缓蚀性能最好。Cl-的存在会阻止PASP在铜电极表面的吸附,使Cu2O膜暴露而受侵蚀,导致了PASP的缓蚀性能变差。The inhibition mechanism of polyaspartic(PASP)on copper electrode in a borax buffer solution was studied by the photocurrent response method.The copper electrode in a borax buffer solution showed p-type photocurrent response which came from Cu2O layer on its surface.The photocurrent response during cathodic polarization became bigger when inhibitor PASP which could be adsorbed on the Cu electrode and make Cu2O layer thicker was added.The bigger the photocurrent response,the better the inhibition effect.When adding PASP with a concentration of 3 mg·L-1,the photocurrent response was the biggest and inhibition of copper corrosion was the best.Cl- could prevent PASP from being absorbed and make Cu2O layer unprotected,resulting in worse inhibition.国家自然科学基金项目(20406009);; 上海市曙光计划项目(04SG55);; 上海市教委重点项目(06ZZ67);; 上海市科委科技攻关计划项目(062312045);; 厦门大学固体表面物理化学国家重点实验室开放课题项目(200512);; 上海市重点学科项目(P1304)~

Inhibition Action of the Self-Assembled Monolayers of 3-Amino-1,2,4-triazole on Brass

3-氨基-1,2,4-三氮唑(ATA)是一种环境友好型金属处理剂,以其在黄铜表面制备了自组装单分子膜(SAMs),用电化学方法研究ATASAMs对黄铜的缓蚀作用及其吸附行为.结果表明,ATA分子易在黄铜表面形成稳定的ATASAMs,SAMs抑制了黄铜的阳极氧化过程,改变了电极表面的双电层结构,固/液界面双电层电容明显降低,有良好的缓蚀效果.研究结果还表明,ATA的吸附行为符合Langmuir吸附等温式,吸附机理是典型的化学吸附.The anticorrosion and inhibiting mechanism for the self-assembled monolayers (SAMs) of 3-amino-1,2, 4-triazole (ATA) on the surface of brass had been investigated by electrochemical method, as well as its adsorption behavior. The results indicated that ATA was liable to interact with brass forming SAMs on the surface of brass. The SAMs changed the structure of the electric-double layer. The SAMs restrained the process of anodic oxidation and had well anticorrosion effect. It was in good agreement with the results by EIS and polarization curve methods. The results from electrochemical measurements indicated that the corrosion resistance for brass electrode was improved by the ATA SAMs. Adsorption of the ATA SAMs was found to follow the Langmuir′s adsorption isotherm, and the adsorption mechanism was typical chemisorption.国家自然科学基金(20406009、50371053);; 上海市曙光计划(04SG55);; 上海市教委重点项目(06ZZ67);; 上海市科技攻关计划(062312045);; 厦门大学固体表面物理化学国家重点实验室开放课题(200512);; 上海市重点学科建设项目(P1304)资

Photoelectrochemical Study of Influence Factors on Corrosion Resistance of Cupronickel B30 in Simulated Water

用动电位伏安法和光电化学方法对模拟水中白铜B30耐蚀性影响因素进行了研究.白铜B30表面膜显示p-型光响应,光响应来自电极表面的Cu2O层,在模拟水溶液中表面膜的半导体性质会发生转变,由p-型转为n-型;在不同Cl-,SO24?浓度的模拟水溶液中,电位正向扫描时呈现阳极光电流,电位负向扫描时随着Cl-,SO24?离子浓度的增加,光响应由p-型向n-型转变,阳极光电流峰面积与阴极光电流峰面积之比增大,耐蚀性能降低;随着温度的升高,白铜B30的耐蚀性能降低;在pH=7～9之间,其耐蚀性能随着pH的升高而提高,当pH>9时,其耐蚀性能随着pH的升高呈降低趋势.Influence factors on semiconduction properties of oxide films on a cupronickel electrode in the simulated water was studied by cyclic voltammetry and photocurrent response method. The cupronickel electrode showed p-type photoresponse, which came from Cu2O layer on its surface. The photoresponse changed to n-type in the simulated water. The transition from p-type to n-type might be related to the doping of Cl- and SO 42? anions into Cu2O film. It did not show n-type photoresponse when the cupronickel elec- trode was immersed in the simulated water containing some sulfide. It was shown that the degree of corro- sion increased with the concentration of these anions and temperature. In addition, as the pH increased be- tween 7 and 9, the corrosion resistance of B30 was enhanced, while it lowered as the pH was beyond 9.国家自然科学基金(Nos.20406009,50371053);; 上海市曙光计划(No.04SG55);; 上海市教委重点项目(No.06ZZ67);; 上海市科技攻关计划(No.062312045);; 厦门大学固体表面物理化学国家重点实验室开放课题(No.200512);; 上海市重点学科(P1304)建设资助项目

Inhibition action and adsorption behavior of environment-friendly inhibitor poly-aspartate on copper

The inhibition action and adsorption behavior of an environment-friendly inhibitor poly-aspartate (PASP) on copper in aqueous NaCl (0.02%) solution were investigated by means of electrochemical techniques. The results indicated that the best inhibition efficiency of PASP was 78.3% with the concentration of 15 mg center dot L-1 at 20 degrees C. The adsorption of PASP prevented Cu from being corroded and PASP was an anodic inhibitor. The inhibition efficiency of PASP decreased with the increase in solution temperature, it decreased to 40.4% at 50 degrees C. The adsorption behavior of PASP followed Langmuir isotherm, it was spontaneous and exothermic, and belonged to chemical adsorption