RUI: Anomalous Codeposition of Nickel-Iron and Nickel-Zinc Alloys

RUI：镍铁和镍锌合金的异常共沉积

• 批准号: 9404871
• 负责人: Thomas Harris
• 金额: $ 21.54万
• 依托单位: University of Tulsa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-01 至 1997-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9404871&HistoricalAwards=false
• 关键词: RUI; Anomalous; Codeposition; Nickel; Iron

9404871 Harris This research is an experimental examination of anomalous codeposition in two different systems, nickel-iron and nickel-zinc. There are several reasons for choosing these particular systems: 1) to determine the mechanism of anomalous deposition; 2) the systems have nickel in common, but the alloys produced when nickel is combined with iron and zinc have different properties; 3) both systems are of importance commercially. Experiments critically test the models or theories of anomalous codeposition. The project starts with the production of alloy deposits within a test matrix that includes the following variables: less noble metal concentration in the solution, pH, current density, and temperature. The deposits produced in these experiments are characterized with respect to their composition, morphology, microstructure and crystalline phase content. These tests identify conditions under which anomalous codeposition does not occur, as well as regimes of anomalous codeposition that are sufficiently dissimilar to suggest different mechanisms. Two additional issues will be examined later in the project. First, hypophosphite, which is able to eliminate anomalous codeposition (at least in the nickel-iron system), will be used as a probe for testing the various anomalous codeposition mechanisms. Secondly, the role of hydrogen, which has been discounted in the nickel-iron system but cannot be ignored with nickel-zinc, will be examined using the electrochemical hydrogen permeation technique. %%% This work should assist in the further refinement of the commercial production and utilization of electrodeposited alloys. Permalloy electrodeposition technology has played an integral role in the evolution of the hard disk drive, and further improvements are limited by our present understanding of the electrochemical processing of this materials. Also, a better understanding of the nickel-zinc system should enhance its utilization as a corrosion- re sistant coating for steel sheet used in automobiles and other applications. ***

9404871哈里斯这项研究是对两个不同系统（镍铁和镍锌）中异常代码的实验检查。 选择这些特定系统的原因有几个：1）确定异常沉积的机制； 2）系统具有共同的镍，但是当镍与铁和锌结合时产生的合金具有不同的特性。 3）这两个系统在商业上都很重要。 实验批判性地测试了异常代码的模型或理论。 该项目始于在包括以下变量的测试矩阵中的合金沉积物的产生：溶液，pH值，电流密度和温度中的较低金属浓度。 这些实验中产生的沉积物的组成，形态，微结构和晶相含量的特征是表征的。 这些测试确定了未发生异常代码的条件，以及与暗示不同机制足够不同的异常代码方案。 该项目稍后将研究其他两个问题。 首先，能够消除异常的代码（至少在镍铁系统中）的低磷石将被用作测试各种异常代码机制的探针。 其次，将使用电化学氢渗透技术检查氢气在镍铁系统中已打折但不能被镍锌忽略的作用。 %%％这项工作应该有助于进一步改进电沉积合金的商业生产和利用。 Permalloy电沉积技术在硬盘驱动器的演变中起着不可或缺的作用，并且进一步的改进受到我们对该材料电化学处理的当前理解的限制。 此外，对镍锌系统的更好理解应增强其用作用于汽车和其他应用中使用的钢板的腐蚀涂层。 ***