• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Corrosion conference and expo >Effect of iron content on localised corrosion resistance of Ni-Cr-Mo alloy weld overlays in chloride ion-containing environments
【24h】

Effect of iron content on localised corrosion resistance of Ni-Cr-Mo alloy weld overlays in chloride ion-containing environments

机译：铁含量对含氯离子环境中Ni-Cr-Mo合金焊缝局部耐腐蚀性能的影响

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Corrosion tests were carried out to determine the effect of iron content on localised corrosion resistance of Ni-Cr-Mo alloy weld overlays (e.g. Alloy 625) in chloride ion-containing environments. A range of iron contents (i.e. 5 - 50%) were examined using coupons extracted from weld overlays deposited on a low alloy steel. The iron content range was achieved by changing the welding parameters and the weld metals were deposited by gas tungsten arc/tungsten inert gas (GTA/TIG) and gas metal arc/metal inert gas (GMA/MIG) welding processes. The electrochemical behaviour of the overlays was determined in acidified 10%w/v NaCl solution at 25°C, using potentiodynamic polarisation curve measurements. Critical pitting temperatures (CPTs) and critical crevice temperatures (CCTs) were determined using standard test methods: ASTM G150 (CPT) and ASTM G48 Methods C (CPT) and D (CCT). Pitting and crevice corrosion tests were carried out in aerated artificial seawater, over a range of temperatures (from 25 to 70°C), and also in 25%w/v NaCl solution containing H_2S/CO_2 at 177°C and 53 bara. The results showed that localised corrosion resistance of the weld overlays was very similar in the range of iron content between 5 and 15%, in the environments tested, and the corrosion resistance was reduced, significantly, at iron contents greater than 30%.
机译：进行腐蚀试验以确定铁含量对含氯离子环境中Ni-Cr-Mo合金堆焊层（例如625合金）局部耐蚀性的影响。使用从沉积在低合金钢上的堆焊层中提取的试样检查了一定范围的铁含量（即5-50％）。通过改变焊接参数来达到铁含量范围，并通过气体钨极电弧/钨极惰性气体（GTA / TIG）和气体金属电弧极/金属惰性气体（GMA / MIG）焊接工艺来沉积焊接金属。使用电位动力学极化曲线测量，在25°C的酸化10％w / v NaCl溶液中确定覆盖层的电化学行为。使用标准测试方法：ASTM G150（CPT）和ASTM G48方法C（CPT）和D（CCT）确定临界点蚀温度（CPT）和临界缝隙温度（CCT）。点蚀和缝隙腐蚀试验是在充气人工海水中，在一定温度范围（25至70°C）以及在177°C和53 bara的含H_2S / CO_2的25％w / v NaCl溶液中进行的。结果表明，在所测试的环境中，在5％到15％的铁含量范围内，堆焊层的局部耐蚀性非常相似，并且当铁含量大于30％时，耐蚀性显着降低。

著录项

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