不同服役条件下冷凝器白铜管的腐蚀特性

来源期刊：中国有色金属学报2005年第11期

论文作者：邓楚平 黄伯云 李卫 潘志勇 李宏英

文章页码：1692 - 1698

关键词：白铜合金; 冷凝管; 组织; 腐蚀特性

Key words：white copper alloy; condenser tube; structure; corrosion characteristic

摘    要：采用拉伸力学性能测试、 扫描金相-微区成分分析和X射线衍射物相分析对冷凝器BFe-30-1白铜管服役前后和不同服役条件下管内壁的腐蚀特性进行了观察和分析。 结果表明： 白铜管服役前的组织性能符合国家标准GB/T 8890—1998的要求； 新管镀膜后使用1.5 a的白铜管内壁出现相对较厚的不均匀疏松沉积层， 去除沉积层后， 白铜管内壁未见明显腐蚀现象； 运行0.5 a后镀膜再使用2 a的白铜管内壁也未见沉积物层， 但可观察到明显的点蚀坑和少量鼓包状腐蚀产物， 说明白铜管镀膜后再使用比使用一段时间后再镀膜的耐腐蚀性能要好； 由于点蚀坑内腐蚀产物中发现了含量较高的CuS和CuCl， 说明循环冷却水中硫元素和氯元素参与了腐蚀过程。

Abstract: The corrosion characteristics of the wall of BFe-30-1 condenser tubes made of white copper under different working conditions were studied by using tensile test, metallography-energy spectrum and XRD analysis techniques. The results show the new white copper tubes accord with national standard GB/T8890—1998. It can be found comparatively thick asymmetry loosen deposition on new plated tubes after one and a half year's using, and there is little evident corrosion under the deposition layer. The white tubes which are plated after half a year's use show evident pitting corrosion hole and a little vesicle-shaped corrosion products. It shows that the corrosion performance of plating before use are better than using before plating. CuS and CuCl which are found in the pitting corrosion holes show that sulfur and chlorine elements participate in the corrosion process.