电站锅炉用碳钢的磷化工艺研究
|
摘要
研究拟对电站锅炉常用碳钢材料表面进行不同酸度条件下的磷化处理,得到磷化处理试样,并对基体材料及磷化处理后的试样进行盐雾试验、极化曲线测试、扫描电镜(SEM)和能谱分析(EDS)等,对所形成磷化膜的成分、结构、形貌和耐蚀性能等进行对比分析,筛选出最优的碳钢磷化工艺。研究结果表明,磷化处理能够大幅度提高碳钢材料的耐蚀性能,可用于电站锅炉常用碳钢材料的表面防护。磷化膜耐蚀性随着磷化液酸度的升高而降低,且游离酸度的变化对膜层性能的影响高于总酸度。合理的磷化液酸度控制范围为,游离酸度(FA)在12.5~13.5点;总酸度(TA)在95.5点左右。
Phosphating carbon steel samples which are common used on utility boilers under different acidity and matrix are tested by salt spray test,polarization curves,SEM and EDS,and the composition,structure,morphology and corrosion resistance are compared and analyzed,then choose the best phosphating process.The results show that phosphating process could greatly improve the corrosion resistance of carbon steel,can be used for surface protection of common carbon steel materials used in Utility Boilers.And the corrosion resistance decreases with the increase of acidity of phosphating solution,the influence of free acidity on properties is higher than total acidity.The reasonable acidity of phosphating solution is free acidity at 12.5~13.5 point;total acidity about 95.5 point.
Phosphating carbon steel samples which are common used on utility boilers under different acidity and matrix are tested by salt spray test,polarization curves,SEM and EDS,and the composition,structure,morphology and corrosion resistance are compared and analyzed,then choose the best phosphating process.The results show that phosphating process could greatly improve the corrosion resistance of carbon steel,can be used for surface protection of common carbon steel materials used in Utility Boilers.And the corrosion resistance decreases with the increase of acidity of phosphating solution,the influence of free acidity on properties is higher than total acidity.The reasonable acidity of phosphating solution is free acidity at 12.5~13.5 point;total acidity about 95.5 point.
引文
[1]刘月.金属表面的磷化处理[J].科技致富向导,2014(06):257.LIU Yue.Phosphating treatment of metal surface[J].Guide of Sci-tech Magazine,2014(06):257.
[2]张瑞.金属磷化处理技术的研究进展[J].洛阳师范学院学报,2009(05):81-84.ZHANG Rui.Research on Progress of Metal Phosphorizing Technology[J].Journal of Luoyang Normal University,2009(05):81-84.
[3]詹华露,李广学,刘万青.磷化处理技术现状及发展方向[J].安徽化工,2013(02):12-15.ZHAN Hua-lu,LI Guang-xue,LIU Wan-qing.Status and Development Direction of Phosphating Technology[J].Anhui Chemical Industry,2013(02):12-15.
[4]李鑫庆,陈迪勤,余静琴.化学转化膜技术与应用[M].北京:机械工业出版社,2005:276-286,292-297.LI Xin-qing,CHEN Di-qin,YU Jing-qin.Technology and Application 0fChemical Conversion Coating[M].Beijing:China Machine Press,2005:276-286,292-297.
[5]RAUSCH W.The Phosphating of Metals[J].Finishing Publications Ltd(UK),1990,406.
[6]ABDALLA K,AZMI R,AZIZAN A.The Effect of Ph on Zinc Phosphate Coating Morphology and Its Corrosion Resistance on Mild Steel[C].Proceedings of the Advanced Materials Research,Trans Tech Publ,2012:569-574.
[7]陈义庆,徐小连,李天统.表面粗糙度对冷轧钢板磷化质量的影响[J].腐蚀与防护,2011,32(09):697-700.CHEN Yi-qing,XU Xiao-lian,LI Tian-tong.Influence of Surface Roughness of Cold-rolled Steel Sheet on Quality of Phosphate Coating[J].Corrosion&Protection,2011,32(09):697-700.
[8]潘玉琛,王正茂,姚振华.提高低碳冷镦钢丝磷化膜面质量的工艺研究[J].金属制品,2009,35(01):19-20.PAN Yu-chen,WANG Zheng-mao,YAO Zhen-hua.Technical Study on Increase Phosphating Film Mass of Low Carbon Cold Heading Steel Wire[J].Metal Products,2009,35(01):19-20.
[9]唐春华.高耐蚀性锌-钙系磷化工艺[J].腐蚀与防护,2004,25(07):307-308.TANG Chun-hua.Zinc-Calcium Phosphating Process of High Corrosion Resistance[J].Corrosion&Protection,2004,25(07):307-308.
[2]张瑞.金属磷化处理技术的研究进展[J].洛阳师范学院学报,2009(05):81-84.ZHANG Rui.Research on Progress of Metal Phosphorizing Technology[J].Journal of Luoyang Normal University,2009(05):81-84.
[3]詹华露,李广学,刘万青.磷化处理技术现状及发展方向[J].安徽化工,2013(02):12-15.ZHAN Hua-lu,LI Guang-xue,LIU Wan-qing.Status and Development Direction of Phosphating Technology[J].Anhui Chemical Industry,2013(02):12-15.
[4]李鑫庆,陈迪勤,余静琴.化学转化膜技术与应用[M].北京:机械工业出版社,2005:276-286,292-297.LI Xin-qing,CHEN Di-qin,YU Jing-qin.Technology and Application 0fChemical Conversion Coating[M].Beijing:China Machine Press,2005:276-286,292-297.
[5]RAUSCH W.The Phosphating of Metals[J].Finishing Publications Ltd(UK),1990,406.
[6]ABDALLA K,AZMI R,AZIZAN A.The Effect of Ph on Zinc Phosphate Coating Morphology and Its Corrosion Resistance on Mild Steel[C].Proceedings of the Advanced Materials Research,Trans Tech Publ,2012:569-574.
[7]陈义庆,徐小连,李天统.表面粗糙度对冷轧钢板磷化质量的影响[J].腐蚀与防护,2011,32(09):697-700.CHEN Yi-qing,XU Xiao-lian,LI Tian-tong.Influence of Surface Roughness of Cold-rolled Steel Sheet on Quality of Phosphate Coating[J].Corrosion&Protection,2011,32(09):697-700.
[8]潘玉琛,王正茂,姚振华.提高低碳冷镦钢丝磷化膜面质量的工艺研究[J].金属制品,2009,35(01):19-20.PAN Yu-chen,WANG Zheng-mao,YAO Zhen-hua.Technical Study on Increase Phosphating Film Mass of Low Carbon Cold Heading Steel Wire[J].Metal Products,2009,35(01):19-20.
[9]唐春华.高耐蚀性锌-钙系磷化工艺[J].腐蚀与防护,2004,25(07):307-308.TANG Chun-hua.Zinc-Calcium Phosphating Process of High Corrosion Resistance[J].Corrosion&Protection,2004,25(07):307-308.