常温清洁铁系磷化液研究

为使磷化实现一级清洁生产,开发了一种用于钢铁表面涂装前处理的常温清洁铁系磷化液。该磷化液组分所有的成分均参加成膜反应生成磷化膜、水、沉渣或在磷化膜干燥过程中挥发。此磷化液不含亚硝酸盐和重金属,在5~40℃下浸渍磷化5~10 m in,在每平方米即可生成质量约为0.7 g的膜和耐CuSO4溶液点滴时间达90~140 s的彩色磷化膜。且磷化后可免水洗。     

铁系磷化工艺

阐述了铁系磷化的成膜机理,这种磷化膜的特点和用途、以及磷化液的组成。介绍了BH-64铁系磷化工艺和该工艺中影响磷化膜性能的因素。     

常温铁系磷化液的研究

为了进一步提高铁系磷化膜的耐蚀性,研究了复合成膜助剂ZY.通过正交实验确定了磷化液的组成,并讨论了磷化温度、溶液pH值以及磷化时间等参数对磷化膜耐蚀性和膜重的影响.结果表明,成膜助剂ZY明显地改善了磷化膜的表面质量,在20℃、磷化20 min时可以获得均匀致密的磷化膜,膜重为1.09/m2,耐CuSO4点滴时间超过200 s,质量分数为3%的NaCl溶液浸泡时间超过5 h.     

高耐蚀彩膜磷化添加剂的研究与应用

研制的高耐蚀彩膜磷化添加剂 ,在铁系磷化液中加入 ( 1 0± 2 ) m L/ L,膜层耐蚀性能提高 1 0～ 2 0倍 ,Cu SO4点滴实验可达 2 0 0 s。介绍了此添加剂的配方、配制、影响效果及对含添加剂的铁系磷化液的性能、应用、优缺点。实验表明 :含添加剂的铁系磷化液具有室温、快速、少渣、无毒的特点     

常温快速磷化工艺的研究

鉴于常温磷化存在成膜速度慢的缺点,在常温磷化液中加入一种促进剂,研制出一种常温快速磷化工艺,研究了磷化液中主要成分及工艺条件对磷化液,磷化膜性能的影响,促进剂的主要成分为间硝基苯磺酸钠,具有氧化作用,能加速晶粒的形成,从而加快磷化速度,并使得磷化膜细致均匀。     

铁系磷化技术及应用

本作论述了铁系磷化的机理，特点及工艺，介绍了国外在铁系磷化方面的研究进展，讨论了促进剂及金属离子对铁系磷化膜耐蚀性的影响，介绍了国内外新开发的取代铁系磷化的锆盐处理工艺，还介绍了一种新开发的耐蚀铁系磷化液。     

室温锌系磷化液的研制

研制出一种以亚硝酸钠为促进剂的室温磷化液。介绍了其组成及配制方法,测定了磷化液及所得磷化膜的性能,分析了膜层常见缺陷并提出了解决方法。结果表明：该工艺磷化成膜速度快,在5～20℃能获得银灰色、均匀、致密、耐蚀的磷化膜。     

新型高效铁系常温磷化液的研制

常温磷化为磷化发展的主要方向,通过对添加了间-硝基苯磺酸钠等添加剂的铁系磷化液进行分析,得出该磷化液具有较好的磷化效果。     

钢管支架内壁磷化膜生锈失效原因分析

通过对磷化膜微观形貌、元素组成以及对磷化液pH值及化学成分的分析,结果表明磷化过程中磷化液酸度过高,造成磷化晶粒过细,成膜不均匀,膜层厚度较薄,是导致钢管支架内壁磷化膜在较短时间内生锈失效的主要原因。通过调整控制镀液pH值1.5～2.0,新制备的磷化膜厚度及均匀性大大增加,其耐蚀性能得到有效提高。     

细结晶磷化膜工艺研究及探讨

以磷化工艺的设计及验证过程为基础对细结晶磷化膜工艺进行研究。此工艺目的是参考大众TL 235标准得到长2~12μm、宽1~6μm,均匀、完整、致密的细结晶磷化膜层。通过优化工艺流程,调整操作参数发现:工件前处理方式、表面调整剂的浓度、磷化液的酸比对磷化膜的成形状态影响较大。经过试验确定了最终的工艺流程和细结晶操作参数,并提出了细结晶磷化膜工艺中需注意的几个问题。     

Evaluation of pre-treatment processes for HRS (hot rolled steel) in powder coating

Hot rolled steel (HRS) is used extensively in the automotive, agricultural and appliance industries. The corrosive response of HRS was investigated after it had been exposed to various surface treatments, prior to powder coating. The behaviour of three conversion coatings: zinc phosphate (ZnP), iron phosphate (FeP) and zirconium (Zr)-based nano-scaled, on HRS was studied. HRS is naturally covered with iron oxide scale and this was removed from the surface by mechanical and chemical processes, prior to the application of surface treatment and organic coatings. The following tests on differently treated panels were conducted to evaluate corrosion performance: adhesion tests such as, crosshatch, pull-off, and conical bending, SEM, XPS, salt spray and electro-chemical impedance studies were also performed. Good correlations were recorded showing that zinc phosphate conversion coating gave the best performance, and zirconium-based nano-structured conversion coating, was superior to that of iron phosphate conversion coatings on HRS.     

镁合金无铬化学转化膜的研究进展

镁合金是工业上应用广泛的轻金属材料,化学转化膜处理技术是提高铝合金耐蚀性的方法之一。综述了镁合金无铬化学转化膜处理技术,介绍了磷酸盐、锡酸盐、高锰酸盐、稀土金属盐和植酸处理等化学转化膜的形成机理,对于转化膜的性能进行了评价,展望了镁合金化学转化膜的发展趋势。     

复合铁钛粉改性环氧富锌重防腐涂料的研究

通过选用纳米改性复合铁钛防锈颜料对环氧富锌重防腐涂料进行改性,制得了具有优异防腐功能的新型环氧富锌涂料;研究了复合铁钛粉的种类及用量对环氧富锌防腐涂料性能的影响;确定了环氧富锌涂料的最佳PV C值。结果表明,当选用纳米改性复合铁钛防锈颜料,用量为8%,涂料的PV C值为42%时,可较大幅度地改善环氧富锌涂料的密封性、附着力、厚涂性,耐盐雾腐蚀可达1542h。     

铝及铝合金无铬表面处理技术研究进展

综述了铝及铝合金无铬表面处理技术,包括锆钛类处理、硅烷处理,稀土转化膜、高锰酸盐转化膜、钴盐转化膜、锂盐转化膜、有机酸转化膜等.目前在实践中获得应用的有锆钛转化处理和硅烷处理,但尚无一种无铬处理工艺能够完全代替铬酸盐处理工艺.     

Formation and characteristics of Al−Zn hydrotalcite coatings on galvanized steel

In this study, a process for depositing hydrotalcite (HT) coatings on galvanized steel was developed and the resulting coatings were characterized. Results showed that coatings formed spontaneously on galvanized surfaces upon exposure to ambient temperature alkaline aluminate solutions. Anodic polarization and electrochemical impedance spectroscopy experiments showed clear evidence of surface passivation. Scanning electron microscopy showed the formation of a continuous and conformal surface film comprised on a compact mass of crystallites. X-ray diffraction confirmed that the coating contained an Al−Zn hydrotalcite compound. Coating formation was enhanced by oxidizer and ammonium salt additions. Coatings formed by using best practices were deposited in less than 10 minutes and demonstrated good surface coverage and good organic coating adhesion. HT coatings formed by using best practices showed excellent organic coating adhesion compared to zinc phosphate control coatings. In salt spray testing, the presence of a hydrotalcite conversion coating under an epoxy neat resin was found to delay the onset of red rusting compared to control samples that were epoxy coated, but not conversion coated.     

铝合金铈盐转化膜的研究

提出了一种铝合金铈盐化学转化成膜工艺,利用电化学方法研究了铝合金铈盐化学转化膜的成膜过程及耐蚀性能,结果表明,成膜促进剂的加入能有效提高铈盐转化膜的成膜速度,所得转化膜对铝合金的点蚀有较好的抑制作用。     

环氧改性有机硅耐高温防腐涂料的研制

以环氧改性有机硅树脂作为漆基,制备了磷酸锌底漆、云母氧化铁中间漆以及不同颜色的面漆,研究了不同漆膜的耐热性以及以磷酸锌底漆加云母氧化铁中间漆复配不同颜色面漆所得复合涂层的耐热性和耐蚀性。结果表明,以磷酸锌底漆、云母氧化铁中间漆和氧化铬绿面漆复配所得的涂层具有较好的耐高温防腐蚀性能,该复合涂层在350°C烘烤3h后,耐冲击强度≥40kg·cm,附着力≤2级,柔韧性≤2mm。     

A novel,two-phase medium for electrochemically induced conversion coatings

A method to facilitate electrochemical coatings from a non-aqueous, poorly conductive (and therefore normally difficult to work with) electrolyte is presented. The process involves loading the electrolyte with pretreated ion-exchange beads to provide multiple low-resistivity paths for ionic but not electronic conduction between a counter-electrode and workpiece. Using the formation of iron phosphate conversion coatings from an oil-based lubricant as a test case, the effects of bead moisture content and oil additive concentration on the coating process are described. With this new approach electrochemical coating is possible, even in poorly conductive fluids, over a far larger range of electrode separations than could otherwise be accomplished.     

Corrosion stability of polyester coatings on steel pretreated with different iron–phosphate coatings

The influence of steel surface pretreatment with different types of iron–phosphate coatings on the corrosion stability and adhesion characteristics of polyester coatings on steel was investigated. The phosphate coating was chemically deposited either from the simple novel plating bath, or with the addition of NaNO₂, as an accelerator in the plating bath. The morphology of phosphate coatings was investigated using atomic force microscopy (AFM). The corrosion stability of polyester coatings on steel pretreated by iron–phosphate coatings was investigated by electrochemical impedance spectroscopy (EIS) in 3% NaCl solution, while “dry” and “wet” adhesion were measured by a direct pull-off standardized procedure. It was shown that greater values of pore resistance, R_p, and smaller values of coating capacitance of polyester coating, C_c, on steel pretreated with iron–phosphate coating were obtained, as compared to polyester coating on steel phosphated with accelerator, and on the bare steel. The surface roughness of phosphate coating deposited on steel from the bath without accelerator is favorable in forming stronger bonds with polyester coating. Namely, the dry and wet adhesion measurements are in accordance with EIS measurements in 3% NaCl solution, i.e. lower adhesion values were obtained for polyester coating on steel phosphated with accelerator and on the bare steel, while the iron–phosphate pretreatment from the novel bath enhanced the adhesion of polyester coating on steel.     

磷酸锌/云铁灰环氧涂层防腐性能的研究

选用磷酸锌为主要防锈颜料,协同云母氧化铁灰,制备无溶剂型环氧防腐涂料.考察涂层的基本性能,并采用交流阻抗(EIS)测试技术,分析了颜料体积浓度(PVC)、活性稀释剂和防锈颜料质量比对涂层防腐性能的影响.实验结果表明:该涂料固含量高达98%以上,是环境友好型涂料;PVC小于12%时,涂层具有较好的防腐性能;PVC为8%,活性稀释剂添加量为2%,云铁灰与磷酸锌质量比为1:4时涂层的防腐性能最佳.在涂层浸泡一定时间后,磷酸锌能防止腐蚀的进一步发生,起到有效抑制腐蚀的作用.