Zn electrodeposition was performed galvanostatically on steel sheets at 1500 A/m~(2) in an agitated sulfate solution at 40°C to investigate the effect of preadsorption of organic additives on the lightness and morphology of Zn. The organic additives employed were classified into two types: 1) polyethylene glycol (PEG), gelatin, and stearyl dimethylbenzyl ammonium chloride (SDBAC) (Type I), which exhibit a polarization effect for Zn deposition; and 2) saccharin and sodium lauryl sulfate (Type II), which exhibit no polarization effect for Zn deposition. The platelet crystals of deposited Zn were reduced in size with preadsorption of all the organic additives considered. The observed decrease in the size of Zn platelet crystals with preadsorption is attributed to both an increase in the overpotential for Zn deposition and a decrease in the epitaxial growth of Zn on steel substrates. The preferred orientation of the {0001} Zn basal plane significantly decreased because of an increase in Zn deposition overpotential owing to preadsorption of PEG and gelatin, and the orientation slightly decreased with saccharin and sodium lauryl sulfate in spite of the absence of a polarization effect on Zn deposition. The surface roughness of deposited Zn decreased with preadsorption of organic additives with the exception of SDBAC. This is due to a decrease in the size of Zn platelet crystals. The lightness of deposited Zn was increased by preadsorption of organic additives with the exception of SDBAC. Because Zn deposited nonuniformly with preadsorption of SDBAC, the surface roughness of Zn increased and the lightness decreased.
展开▼
机译：在钢板上以1500 A / m〜（2）在40°C的硫酸盐溶液中进行恒电流电化学沉积Zn，以研究有机添加剂的预吸附对Zn的亮度和形态的影响。所使用的有机添加剂分为两种：1）聚乙二醇（PEG），明胶和硬脂基二甲基苄基氯化铵（SDBAC）（I型），它们对锌沉积表现出极化作用; 2）糖精和十二烷基硫酸钠（II型），对锌沉积没有极化作用。通过预吸附所有考虑的有机添加剂，可以减小沉积锌的片状晶体的尺寸。通过预吸附观察到的Zn血小板晶体尺寸的减小归因于Zn沉积的过电势的增加和钢基材上Zn的外延生长的减少。由于PEG和明胶的预吸附导致Zn沉积超电势的增加，{0001} Zn基面的首选取向显着降低，而糖精和十二烷基硫酸钠在没有极化作用的情况下却略有降低。锌沉积。除SDBAC外，沉积的Zn的表面粗糙度随有机添加剂的预吸附而降低。这是由于Zn血小板晶体的尺寸减小。除SDBAC外，通过有机添加剂的预吸附可以增加沉积锌的亮度。因为在SDBAC的预吸附下锌沉积不均匀，所以Zn的表面粗糙度增加而亮度降低。
展开▼
