• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ISIJ international >Influence of Annealing Temperature and Dew Point on Kinetics Mn External Oxidation
【24h】

Influence of Annealing Temperature and Dew Point on Kinetics Mn External Oxidation

机译：退火温度和露点对Mn外氧化动力学的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the process of hot-dip galvanizing of steel, alloying elements such as Si and Mn are easily oxidized by H_2O in the annealing atmosphere, causing coating defects. Because this selective oxidation depends on the annealing heat pattern, i.e., the soaking temperature and time, basic research on the kinetics of selective oxidation is important for clarifying the phenomenon of selective oxidation. In this study, the effects of the annealing temperature and dew point on the kinetics and compounds of Mn external oxidation were investigated experimentally, and the Mn external oxidation rate was estimated based on a diffusion equation and thermodynamic equilibrium, considering the diffusion coefficient and the activity coefficient of Mn in steel. The amount of Mn oxide increased in proportion to the square root of the soaking time. This result suggests that Mn oxidation is a diffusion limited process. The Mn oxidation rate increased with increasing temperature and reached a peak value, and at higher temperatures, the Mn oxidation rate became dramatically slower. The peak value also depended on the dew point. To clarify the reason for this slowdown of Mn oxidation, the Mn oxidation rate was estimated. Considering the activity coefficient and the diffusion coefficient of Mn in steel, the calculated Mn oxidation rate was consistent with the measured value. It is thought that the Mn oxidation rate slows at high temperature because the gradient of the Mn concentration around the steel surface becomes small at high temperatures near the equilibrium temperature of Mn/MnO.
机译：在钢的热浸镀锌过程中，Si和Mn等合金元素在退火气氛中容易被H_2O氧化，从而导致镀层缺陷。由于这种选择性氧化取决于退火的热模式，即均热温度和时间，因此对选择性氧化动力学进行基础研究对于阐明选择性氧化现象很重要。本研究通过实验研究了退火温度和露点对Mn外部氧化动力学和化合物的影响，并基于扩散方程和热力学平衡估计了Mn外部氧化速率，并考虑了扩散系数和活性。钢中Mn的系数。 Mn氧化物的量与均热时间的平方根成比例地增加。该结果表明Mn氧化是扩散受限的过程。 Mn的氧化速率随着温度的升高而增加并达到峰值，并且在较高的温度下，Mn的氧化速率变得非常慢。峰值还取决于露点。为了阐明Mn氧化减慢的原因，估算了Mn氧化速率。考虑到钢中锰的活度系数和扩散系数，计算出的锰氧化速率与实测值一致。据认为，由于在接近Mn / MnO的平衡温度的高温下钢表面周围的Mn浓度的梯度变小，因此Mn的氧化速度在高温下变慢。

著录项

  • 来源
    《ISIJ international》 |2018年第9期|1629-1634|共6页
  • 作者

    Yusuke OKUMURA; Minoru TANAKA; Yusuke FUSHIWAKI; Yasunobu NAGATAKI;

  • 作者单位

    Steel Research Lab., JFE Steel Corporation, Kokan-cho, Fukuyama, 721-8510 Japan;

    Steel Research Lab., JFE Steel Corporation, Kokan-cho, Fukuyama, 721-8510 Japan;

    Steel Research Lab., JFE Steel Corporation, Kokan-cho, Fukuyama, 721-8510 Japan;

    Steel Research Lab., JFE Steel Corporation, Kokan-cho, Fukuyama, 721-8510 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    galvanizing; diffusion; dew point;

    机译：镀锌扩散;露点;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号