钢厂煤气管道新型涂料的制备及其防腐蚀防结垢机理  

Preparation of Novel Coating for Steel Plant Gas Pipelines and Its Anti-corrosion and Anti-scaling Mechanism

作　　者：彭程 龙红明 汪磊 PENG Cheng;LONG Hongming;WANG Lei(Baowu Group Environmental Resources Technology Co.,Ltd.,Shanghai 201900,China;School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan,Anhui 243032,China;School of Mechanical and Energy Engineering,Tongji University,Shanghai 201900,China)

机构地区：[1]宝武集团环境资源科技有限公司,上海201900 [2]安徽工业大学冶金工程学院,安徽马鞍山243032 [3]同济大学机械与能源工程学院,上海201900

出　　处：《涂料工业》2025年第3期62-68,共7页Paint & Coatings Industry

基　　金：国家重点研发计划资助项目(2022YFC3901400)。

摘　　要：针对钢厂煤气管道使用过程存在内壁腐蚀和黏结粉尘问题,以气相二氧化硅、碳化硅、胶体石墨、鳞片石墨烯和有机硅聚合物改性液体树脂为原料,采用溶胶-凝胶法制备了有机硅聚合物改性液体树脂-无机填料复合涂料,研究了涂层的润湿性、机械强度、防腐蚀和防结垢性能。结果表明:涂层具有良好的疏水性,表面能为25.91 mJ/m^(2),相比碳钢降低了41.58%,水接触角为120.1°;附着力1级且几乎不受温度变化的影响;经砂纸磨损后,涂层的水接触角仍大于105°,展现出良好的耐磨性;在硫酸、盐酸和氯化钠溶液中的最大腐蚀速率分别为12.36 mg(/cm^(2)∙h)、9.89 mg(/cm^(2)∙h)和2.55 mg(/cm^(2)·h),相比碳钢分别降低了73%、74%和83%;同时,涂层能有效抑制NH4Cl的结晶黏结。在工业现场煤气管道中进行连续5个月防腐蚀和防结垢性能应用测试,相比普通碳钢,涂装涂料的管道表面没有出现明显的腐蚀与结垢行为。气相二氧化硅分子在涂层表面形成了具有疏水性的微纳米结构,填料之间相互重叠形成了类似“迷宫”的结构,以及胶体石墨与碳化硅的协同作用是该涂料表现出优异的防腐蚀防结垢性能的机理。Aiming at the issues of internal wall corrosion and adhesive dust in steel plant gas pipelines,a silicon polymer modified liquid resin-inorganic filler composite coating was prepared by sol-gel method using fumed silica,silicon carbide,colloidal graphite,flake graphene and silicon polymer modified liquid resin as raw materials.The wettability,mechanical strength,anticorrosive and anti-scaling properties of the coating were studied.The results showed that the coating exhibited,the surface energy was 25.91 mJ/m^(2),which was 41.58% lower than that of carbon steel,and the contact angle was 120.1°,exhibiting excellent hydrophobicity.The adhesion strength was grade 1,and almost unaffected by temperature variations.The water contact angle remained greater than 105°after sandpaper abrasion,demonstrating good wear resistance.The maximum corrosion rates in sulfuric acid,hydrochloric acid and sodium chloride solutions were 12.36 mg(/cm^(2)·h),9.89 mg(/cm^(2)·h),and 2.55 mg(/cm^(2)·h),respectively,which was 73%,74%,and 83% lower than that of carbon steel.Additionally,the coating could effectively inhibit the crystallization and adhesion of NH4Cl.There were no significant corrosion or scaling was observed on the coated pipeline surfaces in a five-month continuous corrosion and scaling resistance application test.Benefiting from the hydrophobic micro-nano structure formed by fumed silica molecules on coating surface,"maze-like"structure created by the overlapping fillers,and the synergistic effects of colloidal graphite and silicon carbide,the coating showed excellent anticorrosive and anti-scaling properties.

关 键 词：煤气管道 涂料 防腐蚀 防结垢 应用测试 

分 类 号：TQ635.2[化学工程—精细化工]