《电镀与精饰》2007年第3期

（Ni-P）-钛酸钾晶须化学复合镀层的制备与耐蚀性；镀锡钢板钼酸盐纯化膜的耐蚀性能；化学镀Ni-Cu-P合金镀层耐蚀性的研究；铈对Ni-Mo合金电极析氢性能的影响；玻璃纤维化学镀银的工艺研究     

稀土铈对锌-铁合金镀层耐蚀性的影响

研究了铈盐对电沉积锌-铁合金镀层耐蚀性的影响,通过失重法、浸泡实验、电化学腐蚀参数的测量,得出在镀液中添加一定量的铈盐能显著改善镀层的耐蚀性能.扫描电镜测定镀层表面形貌的结果表明,定量铈盐参与下,可获得更加致密的镀层,这正是提高镀层耐蚀性的原因.     

铜及其合金化学镀工艺研究

研究了铜及其铜合金化学镀Ｎｉ－Ｐ合金的工艺条件，对镀层的性能、成分，结构，耐蚀性和结合力进行了分析研究。研究时效处理条件对镀层结构、硬度、摩擦磨损性能的影响，研究结果表明：该工艺可得到结合力好，磷含量在１２％以上的非晶态合金镀层基表面硬度，耐磨性，耐蚀性都有显著的提高。     

电沉积Ni-Mo-P的工艺与性能研究

采用适宜的溶液组成和工艺条件，能够得到银白色，非晶态Ni-Mo-P合金镀层，研究了不同的工艺条件对镀速和镀层质量的影响，检测了镀层的耐蚀性和显微硬度，得到一些重要结果。     

稀土铈对化学复合镀Ni—P—Si3N4工艺及性能的影响

研究稀土铈对Ｎｉ－Ｐ－Ｓｉ３Ｎ４化学复合镀工艺操作性能及镀层性能的影响,发现在Ｎｉ－Ｐ－Ｓｉ３Ｎ４化学复合镀镀液中加入少量稀土铈能有效地提高镀速及镀液稳定性,并可以提高镀层中ＳｉＮ的共沉积量,增加镀层硬度,但镀层耐蚀性有所下降,镀层结构分析发现镀层由非晶态向微晶态转变。     

Zn-Fe合金镀层耐蚀性研究

通过改变工艺条件,可以从碱性溶液中获得含 Fe0.4～0.8%的 Zn-Fe合金镀层。试验表明这种镀层的耐蚀性是普通镀锌层的2倍。含 Fe 量不同的镀层其耐蚀性也不同。含 Fe 在0.4～0.8%的镀层在5%NaCl 溶液中在稳定电位条件下处于钝化区,而且镀层的极化电阻比较大,是镀锌层的2倍以上,而镀锌层在同样溶液中处于活化溶解区,有很大的溶解电流,而且极化电阻较小。腐蚀后形貌观察也表明 Zn-Fe 合金镀层与镀锌层的特征不同,呈花球状形貌。正是由于上述差异决定了 Zn-Fe 合金镀层的耐蚀性是优良的。     

《电镀与涂饰》2005年第10期主要文章摘要

化学镀铜原理、应用及研究展望；ILH-8型铝件彩虹色处理剂；银-纳米SiO2脉冲复合电镀工艺条件的优化与性能研究；电沉积RE-Ni-W-P-SiC-PTFE复合镀层的耐蚀性研究（Ⅱ）；铝和铝合金电镀前处理工艺及其对镀层结合力的影响。     

微量铈在电镀工业中的应用

论证含铈镀层代金代银镀层的可能性,简介锡铈镀液的特点、镀层的性能及有关配方,探讨铈元素电化掺杂反应的机理.文章提供的配方及其工艺参数有一定的参考价值。     

铈盐对电镀锡参数和性能的影响

研究了镀液中铈盐含量不同时对电镀锡参数及性能的影响.测定了镀液的均镀能力和镀层抗介质腐蚀的能力,探讨了铈盐的加入对镀层电导率的影响,实验证明,一定量铈盐的加入可扩大阴极电流密度范围,增强镀液的均镀能力,加宽镀层的光亮范围,提高镀层的耐蚀性和镀层的电导率,结果表明,铈盐的最佳添加量为15g/L.     

光亮碱性Zn-Al合金电镀工艺研究

在碱性锌酸盐镀锌液中加入铝盐，研究成功了一种光亮碱性锌铝合金电镀工艺。采用霍尔槽试验探讨了镀液成分和工艺条件对镀层质量的影响，检测了镀液和镀层性能。研究结果表明：镀液阴极电流效率达到80%以上，镀液分散能力和复盖能力好，镀层中铝含量为1．5％左右，所形成的Zn-Al合金镀层结晶细致、光亮度好、结合力好、耐蚀性优良，适用于作高耐蚀性镀层。     

钢基电镀铝层阳极氧化处理后的组织结构和性能

用扫描电镜（SEM）和X射线衍射分析（XRD）测定了Q235钢上电镀铝层在硫酸溶液中不同时间阳极氧化处理后的组织结构和表面形貌，并对其硬度和耐蚀性能进行了测试。结果表明：电镀铝层经不同时间阳极氧化处理后，表面由非晶态Al2O3相和Al相组成，其上存在有纳米级的孔洞。随着氧化时间的延长，非晶态Al2O3相增多，Al相减少，氧化膜厚度增加，表面孔洞尺寸增大；氧化膜的硬度呈现先增加后降低，最后趋于稳定，且都显著高于电镀铝层的硬度。并且电镀铝层经阳极氧化处理后，在3．5％NaCl溶液中的电化学耐蚀性能大幅度增加，但随着阳极氧化处理时间的延长，电镀铝层的耐蚀性能降低。     

铈盐对铝合金硼酸?硫酸阳极氧化膜的封闭效应

将铝合金硼酸-硫酸阳极氧化膜浸入铈盐转化液中进行封闭。采用交流阻抗谱技术研究各封闭参数对氧化膜耐蚀性的影响,比较了不同方法封闭的氧化膜的耐蚀性差异。结果表明:将硼酸-硫酸阳极氧化试样浸入30℃的铈盐转化液(5 g/L Ce(NO3)3+0.5%H2O2)中处理30 min后,多孔层电阻Rp大幅增加,且腐蚀电流密度降低1个数量级,耐蚀性明显优于沸水封闭氧化膜的,也稍优于稀铬酸封闭氧化膜的耐蚀性。结合EDS分析表明:铈盐转化封闭后硼酸-硫酸阳极氧化膜的外表面形成了一层完整致密的铈盐转化膜,多孔层内也充满了铈的封闭产物,二者的协同作用几乎完全封住了硼酸-硫酸阳极氧化膜的孔隙,从而有效地提高了氧化膜的耐蚀性。     

钇和铈离子注入纯锆的腐蚀行为研究

为了研究铈,钇离子注入对纯锆耐蚀性的影响,纯锆样品用MEVVA源以40 kV注入1×1016 ions/cm2至1×1017 ions/cm2剂量的钇和铈,注入最高温度约为150℃.用X光电子谱仪(XPS)分析注入表层元素的价态;在1 mol/L硫酸溶液中3次极化测量来研究注入样品的耐蚀性.对于钇离子注入,当注入剂量大于5×1016 ions/cm2时,注入样品的耐蚀性显著提高.用掠角X射线衍射(GAXRD)研究氧化膜中由于铈离子注入发生的相转移.三次极化测量表明注铈样品与空白样品相比,耐蚀性下降许多.最后分别对注入钇和铈样品的腐蚀行为机理进行了探讨.     

稀土元素Ce和时效处理对Al-Li合金剥蚀性能的影响

研究了稀土元素Ce、时效处理以及Al-Li合金表面形 成的贫化层对其剥蚀性能的影响.结果表明，2090合金中加入微量Ce可明显提高其耐剥蚀 性能，但过量则有害.因Al-Li合金的剥蚀抗力与时效过程中T1相析出有密切关系，所以在近 峰值时效状态，合金的剥蚀敏感性较高，欠时效和过时效状态，合金的剥蚀敏感性较低.此 外Al-Li合金表面贫化层能提高其抗剥蚀性能.     

A novel dual nickel coating on AZ91D magnesium alloy

Magnesium alloys covered with metal coating display excellent corrosion resistance,wear resistance,conductivity and electromagnetic shielding properties.The electroless plating Ni-P as bottom layer following the electroplating nickel as surface layer on AZ91D magnesium alloy was investigated.The coating surface morphology was observed with SEM and the structure was analyzed with XRD.Electrochemical tests and salt spray tests were carried out to study the corrosion resistance.The experimental results indi...     

Effect of surface treatments based on self‐assembling molecules and cerium coatings on the AA3003 alloy corrosion resistance

This work presents the effects of a cerium conversion coating, self‐assembling molecules (SAM) treatment, and a combination of these two treatments on the corrosion resistance of the AA3003 alloy. The results were compared to that of a conversion coating treatment with hexavalent chromium (Cr VI). The corrosion resistance of the surface‐treated AA3003 alloy samples was investigated by electrochemical impedance spectroscopy and anodic polarization curves in 0.5 mol/L sodium sulfate solution with pH adjusted to 4.0. The results showed that the SAM treatment offered better corrosion protection for the AA3003 alloy than that provided by cerium conversion coating. The combination of cerium conversion and SAM treatments improved the corrosion resistance of the AA3003 alloy due to SAM adsorption on the alloy substrate exposed at the defects in the cerium conversion layer.     

Effect of HCl pre-treatment on corrosion resistance of cerium-based conversion coatings on magnesium and magnesium alloys

The corrosion protection afforded by a cerium conversion coating, formed by immersion in a solution containing rare earth salt and hydrogen peroxide, on pure magnesium and two magnesium alloys, AZ91 and AM50, has been studied. The effect of HCl pre-treatments on the morphology and on the corrosion resistance of the cerium conversion layer was investigated. A thicker and more homogeneous distribution of the conversion coating was obtained when the sample surface was pre-treated with acid. Higher amounts of cerium on the surface of the pre-treated samples were detected. The cerium conversion coating increased the corrosion resistance of the alloys because it ennobled the corrosion potential and decreased both the anodic and cathodic current. The acid pre-treatment further increased the corrosion resistance of the coated alloys. After five days of immersion in chloride environment the untreated samples showed localized corrosion while the chemical conversion coated samples appeared unaffected.     

An electrochemical and superficial assessment of the corrosion behavior of AA 2024-T3 treated with metacryloxypropylmethoxysilane and cerium nitrate

The present work aims at studying the corrosion behavior of treatments based on the deposition of layers of metacryloxypropylmethoxysilane (MAOS) and/or cerium nitrate on aluminum alloy 2024 T-3 (AA2024-T3). The corrosion resistance was evaluated by electrochemical impedance spectroscopy (EIS) during immersion in 0.1 M Na₂SO₄ and NaCl solutions. Atomic force microscopy (AFM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were also used to perform a surface analysis before and after the treatments. The electrochemical results show that cerium nitrate, when present between two layers of MAOS (sandwich-type deposited layer), improves the corrosion resistance. This can be attributed to the presence of an internal layer rich in silicium and cerium and another external MAOS layer, which further improves the barrier effect of the layer.