氟碳涂层对海洋环境下混凝土抗氯离子渗透性能的影响

目的研究不同氟碳涂层体系对海洋环境下混凝土抗氯离子渗透性能的影响规律及作用机理。方法以溶剂型氟碳涂层和水性氟碳涂层为研究对象,开展了两种溶剂型氟碳涂层体系和一种水性氟碳涂层体系的研究,即环氧底漆-溶剂型氟碳面漆、环氧底漆-聚氨酯中层漆-溶剂型氟碳面漆及水性环氧底漆-水性氟碳面漆。通过氯离子电迁移快速试验,研究涂覆这三种氟碳涂层体系的混凝土抗氯离子渗透性能。采用干湿循环试验模拟浪花飞溅区,通过混凝土抗氯离子侵蚀试验及扫描电镜观察试验,研究涂层对混凝土在海洋环境浪花飞溅区的防腐性能。结果氯离子电迁移快速试验测得的氯离子扩散系数表明,氟碳涂层体系作用下,混凝土氯离子扩散系数降低。干湿循环试验36 d后,通过扫描电镜观察发现这两种溶剂型氟碳涂层体系表面仍然致密,水性氟碳涂层体系表面出现裂缝。结论溶剂型和水性氟碳涂层体系均能提高混凝土抗氯离子渗透性,溶剂型氟碳涂层体系在海洋浪花飞溅区更耐久,更适用于该环境下的混凝土腐蚀防护。     

石墨烯防腐涂层对油罐沉积水的防腐机制研究

目的探究石墨烯基防护涂层/碳钢体系在原油储罐沉积水中的防护机制。方法以实际原油储罐的沉积水为腐蚀介质,以自制石墨烯底漆和石墨烯面漆为防护涂层体系,采用交流阻抗谱、动电位极化曲线,结合盐雾实验探究石墨烯涂层体系在沉积水中的腐蚀行为和失效衍化机制。结果石墨烯底漆在浸泡初期对碳钢具有一定的防护效果,随着浸泡时间的延长,水分子逐渐渗透涂层,涂层逐渐失效。采用石墨烯面漆和石墨烯底漆搭配,可显著提高涂层对碳钢在沉积水中的防护性能,浸泡46 d后,涂层电阻仍为162 M?·cm。结论石墨烯底漆和石墨烯面漆涂层体系对储罐底板在沉积水中具有良好的防护性能,研究成果对油罐底板涂层防护选材具有理论指导意义。     

天冬聚脲涂层体系的防腐蚀性能

制备了以天冬聚脲涂料为面漆的重防腐蚀涂层体系,开展了循环盐雾试验、氙灯老化加速试验及吸水率测试。通过形貌观察、能谱分析、电化学测试、涂层厚度及附着力测试等,研究了该涂层体系的防腐蚀性能及腐蚀老化规律。结果表明：天冬聚脲面漆配套以重防腐蚀底漆和中间漆,涂层的耐盐雾腐蚀和光老化性能优异,附着力良好,吸水率低,可有效抵御湿热盐雾大气环境影响,有效防护金属基体。     

石墨烯改性重防腐涂料在世界最高输电铁塔的防腐应用

针对世界第一380 m输电铁塔在临海海洋大气腐蚀环境的防腐耐候需求,设计石墨烯改性重防腐涂料体系 (包括环氧石墨烯防腐底漆、环氧石墨烯阻隔中间漆和氟碳耐候面漆,其中氟碳面漆采用红白相间颜色,具有防腐和航空标识功能) 对输电铁塔进行防护涂装。通过实验室配方优化、石墨烯改性重防腐涂料性能检测和示范工程涂装,最终定型涂料配方体系。同时针对临海环境室外涂装工况,介绍石墨烯改性重防腐涂料在铁塔镀锌管件的施工工艺和施工经验。     

环氧低表面带锈底漆在沿海炼化装置涂层修复中的应用

介绍了某沿海炼化装置钢结构的普通环氧防腐涂层失效现象,详细分析其涂层失效主要原因为海洋大气中存在高浓度的Cl^-、H₂S、SO₄^2-等腐蚀介质。阐述了一种环氧低表面带锈底漆性能、配方,及与普通的环氧防腐漆对比使用优势,通过运用该环氧低表面带锈底漆与耐候性好的脂肪族面漆,有效延长了沿海地区的炼化装置钢结构涂层使用寿命,为同类装置腐蚀防护提供借鉴经验。     

地面装备用防腐涂层体系现状及发展趋势

针对地面装备的防腐涂层现状,综述了地面装备用富锌底漆/环氧云铁中间漆/高耐候面漆、环氧防腐涂料/丙烯酸聚氨酯面漆、含氯树脂防腐涂层和有机-无机聚合物涂层4种防腐涂层体系的现状及发展趋势,指出地面武器装备的防腐涂层向长效、环保的方向发展,对防腐涂层的选用具有重要的参考价值.     

大型钢结构雕塑的腐蚀防护

雕塑箱体采用热喷涂Al作为基本防护方法,厚度120μm,底漆用环氧富锌漆封闭,环氧云铁漆做中间漆,丙烯酸聚氨酯漆做面漆.经5年使用,没有发生明显的涂层破损和显著的褪色,仅有部分的失光,证明雕塑工程的腐蚀防护体系基本合理.     

复合涂层体系浸泡失效过程电化学阻抗谱特征

通过电化学阻抗技术研究了环氧防锈底漆/环氧云铁中间漆/丙烯酸聚氨酯面漆 (P1) 和环氧防锈底漆/氯化橡胶面漆 (P2) 两种复合涂层体系在60 ℃,3.5%NaCl溶液中恒温浸泡失效过程,得到不同浸泡时期的电化学阻抗谱,分析了电化学阻抗谱中Bode图,涂层电阻,高频电容及特征频率的变化特征.结果表明:在浸泡初期,复合涂层体系低频阻抗值和涂层电阻下降较快,而后下降速率减缓,浸泡中期出现小幅度波动现象;高频电容和特征频率前期增大缓慢,后期增大速率加快,浸泡中期出现小幅度波动.     

快干型高固体分环氧防腐底漆的研究

目的研制高性能快干型高固体分环氧防腐底漆。方法将低黏度高活性环氧树脂和普通环氧树脂进行复配,得到可用于高固含涂料的树脂基料;通过分子结构优化设计,合成制备了以酚醛胺改性聚酰胺树脂为主体并结合柔性长链改性胺树脂复配的固化剂体系;利用复配的环氧树脂基料、自制的固化剂体系和无铬防锈颜料等组分研制了快干型高固体分环氧底漆。根据国家标准,进行了力学性能(包括柔韧性、耐冲击性和附着力)、耐环境性能(包括耐湿热、耐盐雾性能)和耐液体介质等涂层性能测试;通过考核涂层耐丁酮擦拭100次是否露底,来表征涂层的固化,采用FTIR手段,动态跟踪环氧固化过程。结果新研制的环氧涂料具有优良的力学性能和防腐性能,涂料的固含量73%,表干时间40 min,适用期8 h,耐盐雾和湿热均能达到5000 h,全面性能已达到国外现役先进材料水平,且工艺性能良好。结论以低黏度高活性环氧树脂为基体,采用酚醛与柔性长链二聚酸改性的聚酰胺固化剂,可制备高性能快干高固体分环氧防腐底漆,在飞机的防护底漆领域具有良好的应用前景。     

环氧富锌/环氧煤沥青涂层在原油罐底沉积液中失效过程的EIS研究

采用环氧富锌涂料作为底漆,环氧煤沥青重防腐涂料作为面漆,研究了该涂层体系在原油罐底沉积液中失效过程的电化学阻抗谱(EIS)的变化,并提出相应腐蚀阶段的等效电路,讨论了阻抗谱的特征变化与涂层体系结构及性能变化的关系。结果表明,从EIS特征可以反映出涂层体系所处的腐蚀阶段,提出的判断方法可为罐底防腐蚀涂层的失效研究和维修维护提供参考。     

Evaluation of corrosion protection of carbon black filled fusion-bonded epoxy coatings on mild steel during exposure to a quiescent 3% NaCl solution

Carbon black (CB) was mixed with fusion-bonded epoxy (FBE) coatings to generate a series of formulations with 0.5-4% by weight of carbon black. The degradation of these FBE coatings on mild steel exposed to a quiescent 3% NaCl solution was monitored using electrochemical impedance spectroscopy (EIS). The experimental results showed that the electrochemical behaviour of coated systems changed dramatically when the CB concentration reached 3% by weight. This phenomenon was relevant to the formation of the percolation regime in the coating, at which a sharp drop in the electrical resistance of the coating was achieved by the generation of a continuous conducting network. A comparison of the protective properties of the FBE coatings filled with various CB loadings, along with the inspection of view underneath the coatings, indicated that the protective performance of the FBE coating was significantly improved when the CB loading exceeded the threshold concentration. This conclusion was confirmed by the results obtained from Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) measurements.     

电化学阻抗谱研究三种涂层体系的耐蚀性

为选择某型特种装备的表面防腐蚀涂层,利用电化学阻抗谱对H06-4环氧富锌/H53-13环氧云铁/丙烯酸聚氨脂、环氧富锌/厚膜灰云铁环氧/TB06-42丙烯酸聚氨脂和环氧防锈平整底漆/CE-46环氧/丙烯酸聚氨脂三种涂层体系进行了耐蚀性评价测试。结果表明,随着浸泡时间的延长,三种涂层体系的保护作用都降低。对比涂层的阻抗谱变化特征得知,H06-4环氧富锌/H53-13环氧云铁/丙烯酸聚氨脂涂层体系耐蚀性较佳,因此被选为某型装备用防腐蚀涂层。     

氮表面改性非晶碳基涂层的摩擦及腐蚀行为

目的 在本征无氢非晶碳涂层表面进行掺N表面改性处理,研究其摩擦性能与海水腐蚀行为的演变规律,为海洋防护非晶碳涂层应用提供新思路。方法 采用直流磁控溅射固体石墨靶制备非晶碳涂层,并在顶层进行N掺杂表面改性。改变Ar/N2气流量比来控制顶层掺N量,调控沉积时间,控制涂层厚度一致。SEM用于观测涂层厚度与截面形貌,XPS和Raman光谱仪分别用于表征涂层N掺杂量和碳键结构。涂层力学性能和动态摩擦因数则通过连续刚度模式纳米压痕仪和球盘式摩擦实验机测试得到。采用含有三电极体系的Gamry电化学工作站测量涂层的动电位极化曲线、电化学交流阻抗谱等电化学性能。结果 对无氢非晶碳涂层进行表面改性,随顶层改性N含量的增加,sp2—C易与N结合,导致sp2相含量降低。随着N含量的增加,涂层的力学性能逐渐提升,当N质量分数为21%时,硬度与弹性模量达到最大值,分别为11.71GPa和284.28GPa;但当N质量分数最小（12%）时,涂层的断裂韧性与抗弹塑性变形能力最优。由于顶层引入掺N层后,sp2润滑相减少,涂层摩擦因数显著上升,且随N含量的增大逐渐增大。在顶层引入N掺杂量较少的改性层有利于提高非晶碳的耐蚀...     

电化学方法评价涂层颜填料的防腐蚀性能

制备了同一树脂体系的钛白粉、石英粉、复合铁钛粉等三种颜填料的防腐蚀涂料,并用电化学快速评价方法研究了A3钢上应用不同涂层后体系的抗渗透能力和抗腐蚀能力.结果表明,颜填料的种类和颗粒形状对涂料的抗渗透性和抗腐蚀能力有较大影响.     

Studies on corrosion-resistant behavior of siliconized epoxy interpenetrating coatings over mild steel surface by electrochemical methods

Solvent-free siloxane-modified epoxy coatings were developed by the interpenetrating technique using epoxy resin as base (DGEBA, GY 250, Ciba-Geigy) and hydroxyl-terminated polydimethylsiloxane as modifier (commercially known as silicone) with γ-aminopropyltriethoxysilane as cross-linker, dibutyltindilaurate as catalyst, and 25% zinc powder as additive. Hexamethylenediamine (Aldrich) and polyamidoamine (HY 840, Ciba-Geigy) were used as curatives for the siliconized epoxy coatings containing 25% zinc powder. The corrosion-resistant behavior of these coating systems is assessed by electrochemical methods such as electrochemical potential measurements, potentiodynamic polarization, and electrochemical impedance spectroscopic methods. Based on the results obtained from the electrochemical potential measurements for epoxy and siliconized epoxy coating systems, few samples, namely AX₄ and BX₄, have been found to be the best corrosion-resistant coating systems, and they are used for potentiodynamic polarization measurements, electrochemical impedance, and salt-spray tests. The experimental results reveal that the siloxane (10%) modified epoxy coating system (AX₄) with 25% zinc powder cured by hexamethylenediamine offers the maximum corrosion protection to the steel surface rather than the polyamidoamine-cured system (BX₄). The better protective action offered by the coating system (AX₄) is mainly imparted by the reaction of aliphatic amine hydrogens with oxirane groups of the epoxy resin, which gives coating films with a high cross-link density. The observation is further supported by a capacitive behavior in the Nyquist plot and no spreading of visible corrosion product in the salt-spray test.     

Comparison of the degradation behaviour of fusion-bonded epoxy powder coating systems under flowing and static immersion

The degradation of three different fusion-bonded epoxy (FBE) powder coating systems under flowing and static immersion condition has been monitored using electrochemical impedance spectroscopy (EIS) when exposed to 3% NaCl aqueous solution at 60 °C. The aim of this project was to determine the impact of flowing condition on the degradation of the protective properties of polymer coatings during exposure to corrosive medium. Using a rotating cylinder apparatus, the immersion tests under the flowing condition were performed. The relative permittivity of coating, , where the coating capacitance C_c was calculated from the high frequency data of impedance spectrum, was selected as the index to monitor property variation with immersion time. Experimental results showed that the flowing condition aggravated the deterioration of coatings. The results were interpreted in terms of a model in which flowing condition changes coating/solution interface state and then accelerates the ions to diffuse through the coating. The electrochemical results were in agreement with the final visual observation. The present investigation suggests that flowing test provides an effective accelerating way to evaluate the degradation of coating system.     

铝合金表面有机硅环氧涂层的腐蚀电化学行为

研究了铝合金/有机硅环氧涂层电极在5%NaCl(质量分数)溶液中的腐蚀电化学行为,提出了涂层体系在浸泡过程中的不同阻抗模型。结果表明,该涂层体系的作用过程可分为3个阶段:浸泡初期为涂层吸水,中期为烷氧基硅烷的水解和缩聚,后期主要为阻挡层保护。阻抗参数解析表明,涂层中硅烷的水解与缩聚增强了涂层的致密度和交联度,从而使涂层体系在浸泡过程中可实现修复和自愈(或逆损伤)。     

The Electrolytic Oxidation of Copper and Copper Alloys in Hot Alkaline Solution

Results are presented on the anodic coating of copper rich material under conditions to obtain a film of appreciable thickness for practical purposes. The work covered tests on electrochemical aspects of the process and on the composition, physical and protective properties of the coating. Preferred conditions for carrying out the coating process are described.     

Al2O3纳米粒子环氧涂层对钢筋防护性能的电化学噪声分析

目的研究Al2O3纳米粒子环氧复合涂层对钢筋的防护性能。方法制备Al2O3纳米粒子,将其添加至环氧涂料中,并涂覆在工业钢筋表面成膜。通过XRD和SEM对Al2O3进行表征;利用电化学噪声、交流阻抗谱分析技术,对复合涂层在3.5%(质量分数)NaCl介质中对工业钢筋的防护性能进行测试分析。结果制备的氧化铝纳米粒子的粒径平均为75 nm。通过对电化学噪声测试的有效数据进行时域和频域分析,通过交流阻抗谱分析及数据拟合,认为Al2O3纳米粒子添加量为0.1%(以占环氧树脂质量的百分比计)时,涂层对钢筋的防护性能最好。结论向环氧涂层中添加适量的Al2O3纳米粒子,可以明显提升其对钢筋的防护性能。     

PREPARATION OF MICROARC OXIDATION COATING ON (Al2O3-SiO2)sf/AZ91D MAGNESIUM MATRIX COMPOSITE AND ITS ELECTROCHEMICAL IMPEDANCE SPECTROSCOPIC ANALYSIS\par

在硅酸盐电解液体系中, 采用交流微弧氧化方法在增强体体积分数为33%的 (Al₂O₃-SiO₂)_sf/AZ91D镁基复合材料表面制备出完整的保护性氧化膜. 利用SEM, EDS和XRD分析了氧化膜的形貌、成分和相组成, 测量了膜层的显微硬度分布. 采用电化学阻抗谱(EIS)评价了微弧氧化表面处理前后复合材料的电化学腐蚀性能, 确立了不同浸泡时间对应的等效电路. 结果表明, 微弧氧化膜主要由MgO和Mg₂SiO₄相组成, 最大硬度达到1017 HV. 氧化膜电化学阻抗模值|Z|与镁合金基体相比大幅度提高, 耐腐蚀性能明显高于基体. 在3.5%NaCl溶液里浸泡96 h后, EIS出现感抗弧, 显示膜内部开始出现点蚀破坏. 氧化膜耐蚀性由膜内致密层特性所决定.