化学镀Ni—W—P合金镀层的性能研究

一、前言 化学镀镍是近年来国内外迅速发展的表面工程技术之一。化学镀Ni-P合金镀层有其独特的物理、化学性能,因而在工业上有着广泛的用途。但随着工业的发展,要求材料有更高的耐热性、耐磨性、耐蚀性和其它电磁等物理性能。为此,需要设计新的合金镀层体系,三元Ni-W-P合金是近年来人们感兴趣的一种化学镀合金系之一。文献[1～4]报导了这种合金的热稳定性和可焊     

高磷高速化学镀Ni—P合金工艺的研究

通过试验确定高速（１８－３０μｍ／ｈ）、高磷质量分数（１０－１３．５％）化学镀Ｎｉ－Ｐ镀液配方及工艺条件,镀液稳定、镀层性能优良。     

TL—6—2化学镀Ni—P合金工艺研究

通过试验研究，选择出了合理的化学镀Ｎｉ－Ｐ合金工艺，配方与施镀工艺。该镀液性能稳定，便于施镀，调整，使用寿命可达６个周期。该工艺取材于工业级原料，成本低，适于工业生产应用。     

铝及铝合金化学镀Ni—P合金工艺研究

研究以铝为基体的化学镀Ni-P合金镀层的特性,提出能获得高耐蚀性的光亮镀层,含有m_1和m_2复合添加剂的镀液组分和操作条件。并讨论次亚磷酸钠浓度、添加剂m_1和m_2、温度和pH值对Ni-P合金沉积速度的影响。     

化学镀非晶态Ni—Sn—P合金耐蚀性的研究

用化学沉积法获得的Ｎｉ－Ｓｎ－Ｐ合金具有非晶态均相结构，表现出优良的耐蚀性，常温下，在盐酸、氢氧化钠、氯化钠溶液中的耐蚀性均优于不锈钢和Ａ３钢，加入稀土元素能提高Ｎｉ－Ｓｎ－Ｐ合金的耐蚀性。     

石墨化学镀Ni—P合金工艺的研究

介绍石墨化学镀Ni-P合金的工艺方法。研究了在多孔石墨基体上表面金属化处理。采用高效添加剂获得高速稳定性镀液,结合力牢固的镀膜,以及强的耐蚀性和耐磨性。该技术具有较广泛的应用前景。     

含复合络合剂的化学镀Ni—P合金工艺

介绍了一种含有复合络合剂的高稳定性化学镀Ｎｉ－Ｐ合金工艺,并讨论了镀液中各组分作用及工艺条件对沉积速度的影响。     

化学镀Ni-W-P合金对65Mn钢热处理的表面防护

介绍了化学镀Ni-W-P合金对65Mn钢热处理的表面防护工艺及效果。先用化学镀Ni-W-P合金对65Mn钢试件表面进行封装,然后进行860℃盐浴淬火和350℃回火处理,从而既提高了65Mn钢的力学性能,又利用加热过程消除镀件氢脆和进一步提高镀层的防腐蚀性能,并获得具有类似不锈钢光泽的装饰效果。镀层对试件的弹性模量影响很小(2%左右),不影响其作为弹性材料的使用性能。     

低温酸性光亮化学镀镍

通过对络合剂、稳定剂、光亮剂的筛选 ,获得一种较理想的酸性化学镀镍工艺 ,该工艺具有沉积温度低 (70°C左右 )、镀速高 (8～ 1 0 μm/h)、镀层光亮、耐蚀性优异、镀液稳定性好、成本低等特点。     

化学镀三元Ni-W-P合金的沉积条件

介绍在复合络合荆的体系中,用铁族金属诱导共沉积金属钨,得出三元 Ni-W-P 合金镀层的工艺条件,简述镀液成份的作用和对沉积条件的影响,并对镀层的组成、耐蚀性等进行了测试,从而显示了三元合金镀层的优越性。     

镁合金化学镀Ni-W-P合金的研究

为了在镁合金表面得到保护性镀层,研究了镁合金化学镀Ni-V-P的镀液组成和操作条件对镀速的影响,测定了镀层的厚度,显微硬度和结合力,利用X射线衍射(XRD)研究了镀层镀态的结构组织,镀层具有较高的硬度和优良的结合力,镀速由镀液组成的浓度控制.     

The effect of processing gas on corrosion performance of electroless Ni-W-P coatings treated by laser

An investigation of the microstructural and corrosion characteristics of electroless Ni-5.5 W-6.5P coatings on steel substrates after laser treatment in argon and air is presented. The microstructural characteristics of the coatings, in terms of crystallisation, grain size, microstrain, porosity as well as surface chemistry, were examined using quantitative X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Electrochemical tests, using potentiodynamic polarisation in 0.5 M H₂SO₄ solution and electrochemical impedances spectroscopy (EIS) in 3.5% NaCl solution, were undertaken to evaluate the corrosion behaviour of the coatings. The results indicated that the laser-treated coatings consisted of nanocrystalline Ni and Ni₃P phases, along with retained amorphous phase; further, the dimensions of the Ni crystallites were larger than those of Ni₃P. The laser-treated coating in argon revealed the presence of submicron scale porosity, while no porosity was evident in the coating surface treated by laser in air. The uniform corrosion revealed in 0.5 M H₂SO₄ solution is mainly determined by the microstructural characteristics of the coating. Pitting corrosion in 3.5% NaCl solution depended on the amount of porosity on the surface. The laser-treated coating in air exhibited better corrosion resistance in both acidic and chloride environments than that laser-treated in argon.     

次亚磷酸钠体系化学镀镍的电化学研究

运用阳极扫描法他次亚磷酸钠体系化学镀镍在镍电极上的电化学行为。结果表明,化学镀镍的两个部分反应之间存在的强烈的相互作用; 亚磷酸钠的直接氧化产物不是Ｈ３ＰＯ３,其氧化行为受自身浓度、溶液温度、ｐＨ、扫描速度以及Ｎｉ＾２＋浓度的影响。     

金刚石复合镀层的研究

通过硬度和磨损试验,研究了金刚石含量,粒度,镀覆时间和镀后热处理对金刚石复合镀层耐磨性的影响,并据此筛选了最佳镀覆工艺。试验结果表明,在最佳镀覆条件下,金刚石复合镀层的硬度高达HV1889,为Ni-P化学镀层的2．8倍,耐磨性提高更多,可达Ni-P化学镀层的16倍以上,还探讨了金刚石复合镀层的耐磨机理。     

AZ91D镁合金化学镀Ni-P及Ni-W-P镀层的结构与耐蚀性

在AZ91D镁合金上直接化学镀Ni-P和Ni-W-P镀层,并利用扫描电子显微镜、X射线衍射仪及电化学工作站研究后续热处理对化学镀层组织形貌、相组成及其耐蚀性的影响。结果表明,制备的Ni-P镀层为非晶态,而Ni-W-P镀层为纳米晶结构,两者在3.5%NaCl水溶液中的耐蚀性相当。热处理可以明显提高Ni-W-P镀层的耐蚀能力,但却稍微弱化Ni-P镀层的耐蚀能力,热处理后的Ni-W-P层自腐蚀电位相对于未处理的化学镀Ni-W-P或Ni-P层提高了约150 mV。     

Phase transformation behavior of nanocrystalline Ni-W-P alloys containing various W and P contents

In the present investigation, electroless (EL) ternary Ni-W-P coatings were prepared using hypophosphite based alkaline bath by varying sodium tungstate as tungsten source (5-80 g/L). Maximum amount of W incorporation (8.2 ± 1 wt.%) was obtained when the bath contained about 20 g/L of tungsten source. At very high concentrations of W source in the bath the deposit contained about 4 wt.% W and 2 wt.% P. All the as-deposited ternary coatings exhibited nodular surface morphology. X-ray diffractograms (XRD) obtained for as-deposited EL NiWP alloys indicated that crystallinity of the coatings increased with decrease in phosphorus content. Calculated grain size for the deposits varied from 1.2 to 12.7 nm when the tungsten source varied from 5 to 80 g/L in the bath. Higher crystallization temperatures were obtained due to W codeposition in NiP matrix. Presence of metastable phases such as Ni₅P₂ and NiP apart from stable Ni and Ni₃P was identified for the heat treated deposits (400 °C/1 h) containing lower amount of W and higher amount of P. Whereas other ternary deposits after the heat treatment predominantly revealed face centered cubic (f.c.c.) Ni (111) peak. Activation energy for the crystallization of all the alloys has been carried out by modified Kissinger method. Microhardness measurements were carried out on all the deposits isothermally heat treated at 600 °C for 1 h.     

化学镀Ni-W-P或Ni-P合金与油溶性有机钼的协同作用

在45调质钢基体上化学镀Ni-W-P或Ni-P镀层。在基础油中加入3％的二烷基二硫代磷酸钼(简称MoDTP)添加剂，研究了化学镀Ni-W-P或Ni-P镀层与MoDTP的复合摩擦学性能。结果表明，Ni-W-P或Ni-P镀层与油溶性有机钼有良好的协同效应。