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。     

渗氮后氧化处理40Cr钢的耐蚀性能

通过盐雾腐蚀试验法,对不同温度渗氮+后氧化处理的40Cr钢试样及不同表面防护状态下的40Cr钢试样的耐蚀性能进行对比。结果表明,40Cr钢渗氮温度在560～580 ℃之间时,中性盐雾试验时间可达200 h以上;对渗氮后氧化处理后的40Cr钢试验件边缘保护及油封处理后,中性盐雾试验时间可达200 h,外观评级(R_A)为10。     

Comparative assessing on corrosion protection effects of zinc rich ethyl silicate primers modified with undoped and HCl doped PAni–clay nanocomposite

Abstract

This paper presents the works carried out to synthesise undoped and doped polyaniline–clay nanocomposite (PAniCN) by chemical oxidative polymerisation of aniline monomers in the presence of Cloisite 30B nanoclay powders. Fourier transform infrared analysis was used to characterise the synthesised nanocomposites. Electrical conductivity test was used to compare the conductivity of different PAniCN powders. The synthesised nanocomposites were added to a zinc rich ethyl silicate primer to modify the barrier properties of the primer. Unmodified and modified primers were applied on the carbon steel panels separately. The corrosion protection performances of different primers were evaluated via determining open circuit potential (OCP) and electrochemical impedance spectroscopy during immersing in 3·5% sodium chloride solution for a period of 120 days. Electrochemical impedance spectroscopy analysis showed that the coating resistances R_c of modified primers were higher than the original primer. Coating resistance of the undoped and doped PAniCN modified primers and original primer were reached to 6·056×10³, 5·565×10³ and 2·773×10³ Ω cm² after 120 days of immersing respectively. Open circuit potential measurements were carried out in order to evaluate the cathodic protection ability and duration. These measurements revealed that although the undoped PAniCN modified primer showed the highest resistance, the OCP of the panels coated with this modified primer pass through safety region [?0·86 V(SCE)] after 120 days of immersion. Besides salt spray test (according to ASTM B117-03) was used as a widespread accelerated test to evaluate the protection performances of primers. In salt spray test spots of rust appear on the surface of the panels coated with undoped PAniCN modified primer after 1500 h of exposure. The results of OCP measurement test were confirmed by the results of salt spray test.     

纳米Fe2O3作为颜料在涂料中的应用

着重研究了纳米Fe2O3对铁红醇酸底漆的改性作用和纳米Fe2O3加入方式.做了二组典型实验,第一组是将纳米Fe2O3在底漆制备过程中以颜料的形式加入制得纳米复合铁红醇酸底漆,然后与用同样制备工艺和配方但未加入纳米Fe2O3的底漆漆膜性能相对比,发现加入纳米Fe2O3的纳米复合铁红醇酸底漆在耐冲击性、耐磨性、硬度、耐盐雾性、耐水性和抗离子渗透性等,比未加入纳米Fe2O3的铁红醇酸底漆有所提高.第二组实验是将纳米Fe2O3直接加入到成品铁红醇酸底漆中,然后与未加入纳米Fe2O3的底漆对比,发现两种漆在性能上没有明显差别.由此得出纳米Fe2O3应在涂料制备过程中加入才能发挥其作用.     

Prediction of Performance of Primers and its Relationship to the Performance of a Full Paint System in Practice

Abstract

Ten years experience of the development of practical performance tests for the assessment of primer performance on ferrous substrates is presented in chronological form. The usefulness of the new technique in giving reliabable prediction of the true performance of new primer formulations in practice is illustrated. The care with which official salt spray tests must be regarded when used as a sorting test is emphasised and a more reliable ammonium sulphate spray test is proposed.     

镁合金水基金属耐蚀涂层的研究

针对镁合金化学性质活泼、不易直接涂装等特点,研究开发了一种主要由微米金属粉、有机硅烷等组成的新型环保水基金属防护涂层.中性盐雾试验、3.5%NaCl溶液浸泡、电化学阻抗和附着力测试等研究结果表明,该涂层具有良好的结合力、耐热性以及对基体的防护性能.用扫描电子显微镜(SEM)等分析手段研究了涂层的片状层叠组织结构,并探讨了涂层的成膜机理与防护作用.     

The influence of the anion type on the anticorrosive behaviour of inorganic phosphates

The objective of this work was to study the efficiency of the anticorrosive pigments obtained by substituting the phosphate anion in zinc phosphate with other anions such as tripolyphosphate and pyrophosphate. A procedure to prepare the pigments is outlined and their anticorrosive properties were evaluated following the electrochemical behaviour of a steel electrode in pigments suspensions. In a second stage, solvent-borne paints with 30% by volume (v/v) of the pigment, with respect of the total pigment content, and PVC/CPVC (pigment volume concentration/critical pigment volume concentration) ratio 0.8 were formulated. Two resins were chosen as film forming materials: an alkyd and an epoxy one. The performance of the resulting anticorrosive paints was assessed by accelerated (salt spray and humidity chambers) and electrochemical tests (corrosion potential, ionic resistance and polarisation resistance). It was demonstrated that the substitution of the phosphate anion by tripolyphosphate or pyrophosphate anions may give rise to effective anticorrosive pigments for paints. The essays performed with pigments suspensions suggested that zinc pyrophosphate has the best anticorrosive properties. The anticorrosive behaviour of the pigments in paints was found to depend on the resin employed to formulate the coatings. Good correlation was obtained between accelerated and electrochemical tests.     

聚苯胺微乳液及其对水性防腐涂料防腐性能的影响

目的用不同酸掺杂的聚苯胺微乳液制备水性防腐涂料,提高马口铁表面涂层的耐腐蚀性能。方法采用扫描电子显微镜、傅立叶变换红外光谱和热重分析表征聚苯胺性能,通过动电位极化法及耐水性、耐盐雾和耐盐水实验检测聚苯胺微乳液水性防腐涂层的防腐性能,用铅笔硬度和划格法表征涂层的硬度和附着力。结果磷酸掺杂聚苯胺微乳液、本征态聚苯胺微乳液制备的水性防腐涂层都对马口铁起到良好保护作用。含有盐酸掺杂聚苯胺微乳液和不含聚苯胺微乳液的水性防腐涂层在浸泡过程中很快失去保护作用。掺杂态聚苯胺使马口铁表面钝化和屏蔽,本征态聚苯胺起机械屏蔽作用。通过把聚苯胺微乳液添加到水性防腐涂料中,发现涂层的硬度和附着力均没有发生明显下降,表明聚苯胺微乳液在水性防腐涂料中分散均匀,对涂层的性能影响较小。结论当水性防腐涂料中的聚苯胺质量分数为0.3%时,磷酸掺杂的聚苯胺微乳液具有最佳的耐腐蚀性能,其腐蚀电流密度Jcorr=7.359×10-7 A/cm2,腐蚀电位Ecorr=-0.527 V。     

Enhanced corrosion protection by powder coatings on hot rolled steel (HRS) for high-temperature applications

Hot rolled steel (HRS) has long been a major product to the motor industry for bodywork, as galvanised steel (zinc coatings), and it is widely used in building and as tinplate (including tin and chrome oxide coatings) for food, etc. can-making. Among more specialist uses its moderate production costs makes it suitable for the manufacturing process. In this study, newly developed corrosion protection enhanced silicone based powder coating was evaluated on hot rolled steel (HRS). The powder coating in this study was developed to withstand high temperatures up to 550°C without any degradation. In the study silicone resin was incorporated with fillers, corrosion inhibitors and fibres at various compositions to achieve maximum heat resistance and improved corrosion resistance. Protective behaviours of the differently formulated powder paints were investigated before and after heat exposure. The developed paint system was evaluated using various test methods such as heat resistance, salt spray, Electrochemical Impedance Spectroscopy (EIS), adhesion test and microstructure study using SEM. The evaluation of test results revealed that powder coating combining zinc dust particles and mineral fibres have better performance due to better corrosion and adhesion stability in the corrosive environment before and after heat exposure up to 550°C.     

抗菌防霉防腐阻燃一体化纳米涂层应用研究

目的通过特种功能纳米粒子的协同作用以及不同功能涂层的合理配套使用,获得集抗菌防霉、防腐、阻燃和耐磨等多种功能于一体,适用于涉海和航天装备综合防护的多功能纳米涂层材料。方法以环氧树脂为底漆和中间漆的基体树脂,加入多聚磷酸盐和石墨烯复合助剂制备防腐底漆,加入石墨烯和膨胀型阻燃剂为复合阻燃助剂制备阻燃中间漆;以丙烯酸改性聚氨酯为面漆基体树脂,加入吡啶硫酮锌和纳米银抗菌复合助剂以及纳米陶瓷颗粒耐磨助剂,制备抗菌防霉耐磨聚氨酯面漆。将防腐底漆、阻燃中间漆和抗菌防霉耐磨面漆合理搭配,制备多功能一体化综合防护涂层材料。通过铅笔硬度测试、划格法附着力测试、耐冲击强度测试和耐人工老化测试评价纳米涂层的常规性能,通过盐雾测试研究防腐性能,通过燃烧实验研究阻燃性能,通过抗菌防霉实验研究抗菌防霉性能,通过摩擦实验评价其耐磨性能。结果经测试,纳米涂层的硬度为H,附着力为0级,耐冲击强度为50 kg·cm。800 h人工老化试验后,漆膜无明显变化。800 h中性盐雾测试后,基体无腐蚀点。12 s垂直燃烧实验研究发现其平均烧焦长度仅为1 mm,滴落物的续燃时间为0 s。烟密度研究发现纳米涂层240 s的Dm平均值仅为13,抗菌、防霉实验表明该纳米涂层对大部分细菌的抑菌率高达99%,其防霉等级为0级,耐磨性能测试发现涂层的质量损失为32 mg。结论所研制的一体化纳米涂层具有优异的防腐、阻燃、耐磨和抗菌防霉性能,可以在航天航空以及海工设施等特种设备上使用,能够起到综合防护作用。     

水性集装箱涂料应用现状及研究进展

总结了水性集装箱涂料在国内外的应用现状和最新研究进展,指出随着人们环保意识的不断增强,国际社会对集装箱用涂料在环保方面提出了更高要求,集装箱涂料水性化成为一种必然,且实践证明集装箱涂料水性化是可行的。水性集装箱涂料具有环保、安全的优点,今后必然在集装箱涂料应用领域中产生变革性的影响。对不同体系集装箱涂料的膜厚规范,以及溶剂型涂料体系与水性集装箱涂料体系的综合性能进行了对比,综述了三涂层体系和二涂层体系为现有水性集装箱涂料的2种主流配套体系,并对2种体系的基本组成及各涂层的功能进行分析,讨论了不同集装箱涂层体系的优缺点,指出国内水性集装箱用涂料的技术瓶颈,列举了近年来在水性集装箱涂料方面的主要研究方向及最新研究成果,最后结合目前国内水性集装箱涂料应用的发展水平,提出在水性集装箱涂料的制备过程中,可在涂料用树脂或者基料的合成、改性方面进行更深入的研究和探索,努力提高涂料的综合力学性能,从而实现水性集装箱涂料行业的可持续发展。     

2024铝合金化学转化膜与磷化底漆耐蚀性的研究

通过盐雾实验、稳态阳极极化曲线和电化学阻抗谱3种测试方法，对磷化底漆和阿洛丁(1200)化学转化膜进行了测试，结果发现磷化底漆的耐蚀性明显优于阿洛丁化学转化膜．在中性盐雾实验10个周期中，阿洛丁化学转化膜腐蚀明显，而磷化底漆完好如初．在稳态和弱极化区，两者抗蚀性能相似，而在强极化区，磷化底漆明显优于阿洛丁化学转化膜、在电化学阻抗谱上，磷化底漆极化电阻(Rp)比阿洛丁转化膜高1个数量级．     

海洋工程用结构铝合金无铬化学转化膜耐腐蚀及涂装配套性能

为改善服役于海洋环境下的结构铝合金的耐腐蚀性及其与底漆的配套性能,在两种典型海洋工程用结构铝合金(5083-H116和6061-T6)基体上制备了一种无铬钛/锆基化学转化膜———Alum-nanoceramic coating。采用扫描电子显微镜(SEM)和能谱仪(EDS)对膜层形貌及组成进行了表征,通过动电位极化曲线和电化学阻抗谱研究了膜层的电化学性能,利用中性盐雾试验及胶带剥离试验分别对膜层耐蚀性及其与环氧厚浆底漆的配套性进行了考察。结果表明:5083和6061铝合金Alum-nanoceramic无铬化学转化膜中性盐雾试验白锈面积达到5%所需时间分别为240h和168h;5083铝合金Alum-nanoceramic膜层比后者显示出更好的与环氧厚浆底漆的配套性能。     

Untersuchung der Eigenschaften von nach einem neuen Verfahren hergestellten Phosphatüberzügen

Investigation into the properties of phosphate layers obtained according layers obtained according to a new process Phosphate coatings were obtained by anodic phosphatizing in sodium phosphate solutions (2.5-5% phosphate, PH 4.2-5.4, current density 2.5-5.0m Amps/cm²). The coatings (coating weight 7.3–20 g/cm₂) consist of ferrous/ferric phosphates, the Fe²⁺: Fe³⁺ ratio depending from bath composition. he hardness of the coatings is lower than the hardness of coatings from Zn and Mn phosphate baths and their absorption capacities for chromic acid, mineral oil and paints are higher because of their fine crystalline structure. With respect to corrosion behaviour they are superior in NaCl and equivalent to Zn and Mn phosphate coatings in moist atmospheres, while the latter seem to be superior in the salt spray seem to be superior in the salt spray test. The minimum coating thickness required for subsequent painting is 8/m² subsequent oil impregnation or cold working require higher weight.     

Korrosions- und Erosionsschutz von Metallen und alkalischen Untergründen

Corrosion and erosion protection of metals and alkaline surfaces With the aid of numerous examples, it is shown that a suitable construction has an important bearing on the durability of coatings. In recent years, zinc-rich primers on metal sheeting have assumed increasing importance as they preserve the weldability of the metal. A simple apparatus has been designed for the determination of the Zn vapours released during welding. Increasingly important, too, are thick coating systems, especially because of the saving in labour. Paints for non-derusted bases should be regarded with scepticism. Alkaline bases (concrete, mortar) call for alkaline-resistant coatings (e.g. facade paints or sealing compounds for plaster cracks) or, additionally, for resistance to heating oil (heating oil troughs). Among recent developments are paints with multi-colour effect and paints etc. for road markings.     

蜡膜防锈油的研制与应用

研究了蜡膜防锈油的配方及其制备方法，分析了防锈油组成材料的作用，并对其进行了理化性能和使用性能的检测。结果表明，BM-B蜡膜防锈油所形成的致密稳定油膜具有抵抗盐雾侵蚀的良好性能。     

Effect of surfactant on the alumina dispersion and corrosion behavior of electroless Ni?P?Al2O3 composite coatings

Electroless Ni? P? Al₂O₃ composite coatings have been synthesized on mild steel shafts using surfactant cetyltrimethyle ammonium bromide (CTAB) as dispersant. The effects of the surfactant on the alumina dispersion, weight fraction in coatings, and corrosion resistance of the composite coatings under salt spray test were investigated. Results showed that alumina dispersion was improved, whereas weight fraction was decreased, with the increasing concentration of the dispersant CTAB. The corrosion resistance of the composite coatings was found to increase with the increase in CTAB concentration up to a certain optimum of 20 mg/L, beyond which a decreasing trend of corrosion resistance was observed under salt spray test. Compared with Ni? P coating, all the Ni? P? Al₂O₃ composite coatings showed improved corrosion‐resistant properties.     

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。     

电弧喷涂锌基防腐涂层在洞室环境中的耐蚀性研究

采用高速电弧喷涂技术在16MnR钢上制备了Zn和Zn-Al涂层,通过盐雾加速实验考核涂层在5％NaCl溶液中的腐蚀性能,并对涂层腐蚀前后的组织结构进行分析.结果表明,两种Zn基涂层致密,在盐雾实验40 d后未出现红锈,表现出优异的耐腐蚀性能.喷涂纯Zn涂层,其腐蚀产物疏松,对基体主要起到牺牲阳极的保护作用;喷涂Zn-Al涂层,其腐蚀产物致密,起到牺牲阳极和隔离的双重保护作用.     

AZ91D镁合金表面转化膜腐蚀及防护涂层性能研究

采用高锰酸盐、钼酸盐、锡酸盐转化液分别对AZ91D镁合金进行表面化学转化,得到三种不同的化学转化膜。分别通过SEM、EDS和全浸试验研究不同转化膜的表面微观形貌、成分和腐蚀率,通过划格法和中性盐雾试验法研究转化膜外部有机涂层的附着性能和耐蚀性能。结果表明,高锰酸盐和钼酸盐转化膜表面具有大量微细裂纹,锡酸盐转化膜表面呈鱼鳞状,均为后续涂装提供了具有一定粗糙度的表面。锡酸盐转化膜的耐蚀性最好,高锰酸盐转化后并涂层的附着力和耐蚀性能最好。