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研究了球状锌粉取代片状锌粉对无机富锌漆阴极保护性能的影响。采用开路电位法评价涂层的阴极保护性。用差示扫描量热法测涂层锌含量,并测试涂层在NaCl溶液中浸泡初期的交流阻抗谱。开路电位测试结果表明,取代后阴极保护期缩短,随着取代比的增大,阴极保护期延长,向未取代时的水平靠拢;差热法和交流阻抗的测试结果显示,随着取代比的增加,涂层锌含量增加,涂层中活性锌的面积减小。锌含量的增加有利于阴极保护性能的提高,而活性锌面积的减小不利于阴极保护性能,由于两个因素的综合作用,导致了球状锌粉取代后涂层的阴极保护性能下降,但又随着取代比的增大而增强。采用恒电流溶解法,快速评价富锌漆阴极保护性,并与传统的开路电位法比较。实验结果表明,恒电流溶解法与开路电位法用于评价富锌漆的阴极保护性能时有较好的相关性。 相似文献
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将碳纳米管( CNTs)以水性浆料的形式添加在环氧乳液中,制备 CNTs改性水性环氧富锌防腐涂料以解决传统富锌涂料高锌含量的问题。通过 SEM来观察涂层的形貌,附着力、耐冲击测试表征涂层的机械性能,开路电压、极化曲线和耐盐雾等方法探讨碳纳米管含量对环氧富锌防腐涂层防腐性能的影响。结果表明:涂层中添加 CNTs可以增强涂层的耐冲击性,且 CNTs对涂层附着力的影响不显著;涂层防腐性能随 CNTs含量的增加呈现先增强后减弱的趋势;在 60.0%锌含量体系中,添加 0.2%含量的 CNTs,与 60.0%锌含量空白组比较,涂层腐蚀电流密度降低 66.7%,与 70.0%锌含量空白组比较,其腐蚀电流密度也可降低 53.8%,且耐盐雾实验 2 000 h后,涂层仍未出现明显腐蚀现象,即在60.0%锌含量体系中添加 0.2%含量的 CNTs,不仅可以降低涂层 10.0%的锌含量,还可以增强涂层的防腐性能。 相似文献
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通过水性环氧分散体及改性胺固化剂、锌粉含量及粒径、防闪锈剂种类及用量等多个方案的研究,制备了低膜厚高防腐的水性环氧富锌涂料.结果表明:水性环氧分散体自身稳定性和富锌搭配稳定性非常重要,选择800目锌粉,含量占整个涂膜80%,涂膜的防腐性能最好;筛选解决闪锈问题又不影响耐盐雾的防闪锈剂,加入量为0.3%,涂料综合性能最好... 相似文献
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Electrochemical impedance spectroscopy investigations of epoxy zinc rich coatings: Role of Zn content on corrosion protection mechanism 总被引:4,自引:0,他引:4
Effect of zinc content in the epoxy zinc rich coating on the mechanism of corrosion protection was investigated using electrochemical impedance spectroscopy (EIS). The zinc content in the coating (on dry film) was varied from 40% to 90% in steps of 10%. Open circuit potential (OCP) measurements and salt spray tests were also carried out to generate supporting evidences and to deepen the understanding in the area of zinc rich coatings. The healing or bridging ability of these coatings was studied by making a scribe on the coating and monitoring the evolution of OCP. EIS was also utilized to screen the amount of zinc particles required to provide efficient galvanic protection and to study the effect of purity of Zn on corrosion protection performance. Both EIS and OCP measurements indicate that coatings containing 40% Zn (on dry film) provides very good barrier protection coming mainly from polymer whereas the one containing >80% Zn provides excellent galvanic protection to the steel substrate. When the zinc loading is between 60% and 70%, coatings neither show barrier protection nor galvanic protection. 相似文献
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用矿粉对环氧树脂基混凝土修补材料进行改性,测试改性修补材料的力学性能和耐久性.结果表明:当矿粉完全替代水泥时,修补材料的抗折强度超过12.5 MPa,抗压强度为65.6 MPa.矿粉-环氧树脂基混凝土修补材料的耐久性优良,矿粉替代100%水泥的修补材料在质量分数3%NaCl溶液中侵蚀365 d后的抗压强度保持率为95.7%,在3%MgSO4溶液中侵蚀365 d后的抗压强度保持率为98.4%.经50次冻融循环后,试样C0S50~C50S0的抗压强度保持率均约为100%,200次冻融循环后,抗压强度保持率高于95%. 相似文献
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为了改善水性锌铝合金涂层的耐蚀性能,在硅烷钝化液中加入玻璃粉制备了玻璃/水性锌铝涂层,采用中性盐雾试验、电化学阻抗谱、极化曲线等方法研究了玻璃粉用量对Q235钢表面该涂层耐蚀性能的影响,利用扫描电镜、能谱、X射线衍射等技术分析了涂层的形貌、组成以及元素分布状况.结果表明,添加片状玻璃粉可以提高涂层的耐蚀性能.玻璃粉与金属粉以平行叠加的方式排列在锌铝合金涂层中,部分玻璃粉包覆在涂层的外围形成致密的网状结构.当玻璃粉的添加量为20 g/L时,涂层的耐蚀性能最好,耐中性盐雾试验时间为3 100h,是不添加玻璃粉涂层的5倍. 相似文献
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M. T. Rodríguez S. J. García R. Cabello J. J. Suay J. J. Gracenea 《Journal of Coatings Technology and Research》2005,2(7):557-564
The influence of the glass transition temperature and the mechanical and anticorrosion properties of factors such as the amount
of plasticizer added to an epoxy primer were investigated by DSC (differential scanning calorimeter), DMA (dynamic mechanical
analysis), stress-strain tests, salt fog spray tests, accelerated tests, and electrochemical tests.
The addition of plasticizer results in a decrease in the glass transition temperature and a change in the mechanical properties.
Different tests were carried out to the optimum percentage of plasticizer content (1.5–3% weight ratio to epoxy resin) required
to obtain the maximum anticorrosion performance of the epoxy primer. These changes are explained by the structural-kinetic
effect exerted by the plasticizer on the chemical crosslinking in the course of the epoxy network synthesis and the increase
in the excess free volume. 相似文献
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This work aimed to address the issues that arise when cathodic protection is applied to a coated structure. The use of zinc chloride (ZnCl2) as a corrosion inhibitor was suggested; the idea was to bridge the weakly cross linked areas on the coating by depositing a film of zinc compounds in order to seal them from the corrosive environment. 相似文献
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采用电化学阻抗谱(EIS)测试技术并结合宏观形貌观察,研究了不同厚度的储油罐环氧耐油导静电涂层在高温(80℃)和常温原油积水中浸泡后的防护寿命.结果表明,提高浸泡温度与延长浸泡时问对涂层具有相同的破坏效果,10 mHz频率处104 Ω的总阻抗值是判定环氧耐油导静电涂层在原油积水介质中防护寿命的量化值. 相似文献
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碳钢被广泛应用于工农业生产中,智能涂层的研究和应用为碳钢的腐蚀防护提供了新的途径。本文以正硅酸乙酯(TEOS)为原料,通过加入扩孔剂1,3,5-三甲苯(TMB)合成了大孔径的介孔SiO2纳米容器(MSNs),采用聚丙烯酸(PAA)对MSNs进行化学修饰制备了一种装载缓蚀剂苯并三氮唑(BTA)的pH敏感性智能纳米容器BTA@MSNs-PAA。通过扫描电子显微镜(SEM)、动态光散射粒径分析(DLS)、X射线衍射分析(XRD)、傅里叶红外光谱(FTIR)、热重/差热分析(TGA/DTA)和紫外可见光谱(UV-vis)对BTA@MSNs-PAA的结构和性能进行了表征。通过将BTA@MSNs-PAA掺杂到环氧树脂涂层中,在碳钢表面制备了一种智能防腐涂层,采用电化学阻抗谱(EIS)和盐雾加速腐蚀试验对智能涂层的防腐性能进行了评价。结果表明,BTA@MSNs-PAA近似呈球形且表面光滑,平均粒径为320nm。BTA@MSNs-PAA可通过PAA与BTA之间的静电相互作用装载BTA分子,其装载量可达16.49%,BTA@MSNs-PAA可响应酸性刺激而加速释放BTA分子。基于BTA@MSNs-PAA的智能防腐涂层对碳钢表现出显著的腐蚀防护性能,这可能是因为当碳钢基体发生腐蚀时,其腐蚀点位下降的pH触发纳米容器快速释放BTA分子,从而有效抑制了基体的进一步腐蚀。 相似文献