吴永忠,任坤,谢鸥,卢金斌.盐雾环境下X70管线钢等离子喷涂铝涂层的腐蚀行为[J].表面技术,2019,48(5):85-89.
WU Yong-zhong,REN Kun,XIE Ou,LU Jin-bing.Corrosion Behavior of Plasma Sprayed Aluminum Coating for X70 Pipeline Steel in Salt Spray Environment[J].Surface Technology,2019,48(5):85-89 |
| 盐雾环境下X70管线钢等离子喷涂铝涂层的腐蚀行为 |
| Corrosion Behavior of Plasma Sprayed Aluminum Coating for X70 Pipeline Steel in Salt Spray Environment |
| 投稿时间：2018-11-14 修订日期：2019-05-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.05.013 |
| 中文关键词: 等离子喷涂 X70管线钢 铝涂层 点蚀 涂层质量 盐雾腐蚀 |
| 英文关键词:plasma spraying X70 pipeline steel aluminum coating pitting corrosion coating quality salt spray corrosion |
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| 中文摘要: |
| 目的 研究X70管线钢的防腐工艺，以延长其使用寿命。方法 采用等离子喷涂方法在X70管线钢基体表面制备铝涂层，通过扫描电镜（SEM）和能谱仪（EDS）对涂层表面、界面质量和微观形貌进行分析。利用盐雾腐蚀试验，对比分析涂层对基体的保护作用机制。结果 涂层为富铝层，主要以富铝脆性物相存在，并受环境空气的影响，涂层出现孔洞、裂纹和未熔颗粒等缺陷。涂层表面因铝粉颗粒尺寸差异，颗粒间熔融状态不同，导致表面铝元素呈波浪式分布。涂层界面结合处，铁、铝元素相互渗透，形成Fe-Al冶金结合，增加了涂层结合强度。热处理后，未熔颗粒及部分金属氧化物熔化并填充涂层缺陷，减小了表面粗糙度和孔洞率，提高了涂层质量。盐雾腐蚀16 h后，未喷涂涂层试样表面出现了严重的点蚀现象，影响了管线钢的使用寿命。喷涂铝涂层试样在盐雾腐蚀试验120 h后，表面出现了轻微腐蚀现象。结论 涂层表面形成了致密氧化膜，避免了腐蚀介质和基体直接接触，提高了X70管线钢的耐腐蚀性。 |
| 英文摘要: |
| X70 pipeline steel often fails due to corrosion during working. The work aims to study the anti-corrosion methods to extend the service life. Plasma sprayed aluminum coating was adopted to protect the substrate. The surface, interface quality and micro morphology of coating were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Salt spray corrosion test was used to compare coating protection mechanism. The results showed that the coating was aluminum-rich coating and mainly consisted of aluminum-rich brittle phase. Affected by air, the coating had some defects on surface like pores, micro-cracks and un-melted particles. The element aluminum was distributed in wave on the coating surface due to difference of melting degrees of particles in different sizes. The coating bonding strength was enhanced due to the Fe-Al metallurgical bonding caused by inter-infiltration between Fe and Al. After heat treatment, part of oxides and un-melted particles were fused by the heat and then flowed into the coating gaps, thus decreasing the coating porosity and reducing surface roughness, and enhancing the coating quality. The un-treated substrate surface showed serious pitting corrosion after 16 h of salt spray corrosion test, which affected the pipeline steel service life. There was only slight corrosion phenomenon on the coating surface after 120 h corrosion test. The oxidation film formed on the coating surface acts as a barrier between corrosion mediums and substrate, and enhances the anti-corrosion property of X70 pipeline steel. |
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