Jiang Weiqin*,Ma Dachao.Preparation and corrosion resistance of surface coatings on steel for construction[J].Plating & Finishing,2024,(7):58-63.[doi:10.3969/j.issn.1001-3849.2024.07.009]
建筑用钢表面镀层制备与耐蚀性能研究
- Title:
- Preparation and corrosion resistance of surface coatings on steel for construction
- Keywords:
- steel for construction ; surface coating ; concentration of PTFE colloid ; microscopic morphology ; corrosion resistance
- 分类号:
- TG174.4
- 文献标志码:
- A
- 摘要:
- 为了提升建筑用 Q345 钢的表面耐蚀性能,采用化学镀的方法在建筑用钢表面制备了 Ni-P 和 Ni-P-PTFE (聚四氟乙烯)复合镀层,考察了 PTFE 乳液浓度对表面镀层显微形貌和耐蚀性能的影响。结果表明, Ni-P 镀层和 Ni-P-PTFE 镀层中均可见非晶态结构,在镀液中加入 PTFE 后 Ni-P-PTFE 镀层中还形成了 Fe 3 C 和 P 4 S 3 相。在镀液中加入不同浓度 PTFE 乳液后, Ni-P-PTFE 镀层的 Ni/P 原子比有不同程度降低(介于 4.08~5.04 ),但随着 PTFE 乳液浓度增加,镀层中 F 元素含量逐渐升高、 Ni/P 原子比逐渐增大。 PTFE 乳液浓度为 0.4 mL/L 时 Ni-P-PTFE 镀层表面较为平整、光滑,镀层表面由于脱氢反应而形成的微孔消失。不同浓度 PTFE 乳液的 Ni-P-PTFE 镀层的耐蚀性能都优于 Ni-P 镀层,且 PTFE 乳液浓度为 0.4 mL/L 时镀层的耐蚀性最好,在建筑用 Q345 钢表面制备 Ni-P-PTFE 镀层可以获得良好的耐蚀性,适宜的 PTFE 乳液浓度为 0.4 mL/L 。
- Abstract:
- : In order to improve the surface corrosion resistance of Q345 steel for construction , Ni-P and Ni-P-PTFE ( polytetrafluoroethylene ) composite coatings were prepared on the surface of construction steel by electroless plating. The effect of the concentration of PTFE colloid on the surface morphology and corrosion resistance were investigated. The results showed that amorphous structures were visible in both Ni-P and Ni-P-PTFE coatings. After adding PTFE to the plating solution , Fe 3 C and P 4 S 3 phases were also formed in the Ni-P-PTFE coating. After adding different concentrations of PTFE colloid into the plating solution , the Ni/P atomic ratio of the Ni-P-PTFE coating decreases in varying degrees ( between 4.08 and 5.04 ) . With the increase of the concentration of PTFE lotion , the content of F element in the coating gradually increases , and the Ni/P atomic ratio gradually increases. When the concentration of PTFE colloid is 0.4 mL/L , the Ni-P-PTFE coating surface is relatively flat and smooth , and the micropores formed on the coating surface due to the dehydrogenation reaction disappear. The corrosion resistance of Ni-P-PTFE coatings with different concentrations of PTFE colloid is better than that of Ni-P coating , and the coating has the best corrosion resistance when the concentration of PTFE colloid is 0.4 mL/L. Ni-P-PTFE coating on Q345 steel for construction can obtain good corrosion resistance , and the appropriate concentration of PTFE colloid is 0.4 mL/L.
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备注/Memo
收稿日期: 2024-02-19 修回日期: 2024-03-26 作者简介: 蒋伟勤( 1984 —),男,硕士,高级工程师,研究方向为金属腐蚀, email : weiqing84@sina.com 。 基金项目: 广西科技重大专项(桂科 AA23073018 );广西高校中青年教师科研基础能力提升项目( 2022KY1692 )。