公开(公告)号：US11796170B2

公开(公告)日：2023-10-24

申请号：US17723408

申请日：2022-04-18

申请人： ZHEJIANG UNIVERSITY

发明人： Zengyi Ma ,  Jianhua Yan ,  Yike Zhang ,  Wenhan Li ,  Ruofeng Gao ,  Zhe Chen ,  Yaming Cai ,  Pucheng Zhong

IPC分类号： C23C22/08 ,  C23C22/74 ,  F16L58/14 ,  F22B37/02 ,  F22B37/04 ,  F22B37/06

CPC分类号： F22B37/025 ,  F22B37/04 ,  F22B37/06

摘要： Disclosed is a heat exchange tube of waste heat boiler, which includes a tube body. The outer surface of the tube body is sprayed with a layer of anti-corrosion coating. The components of the anti-corrosion coating are Al2O3, CaAl2O4 and Ca3(PO4)2. On the surface of nano anti-corrosion coating, HF reacts with Al2O3, CaAl2O4 and Ca3(PO4)2 to form AlF3 and Ca5(PO4)3F, which are tightly wrapped on the surface of the coating, thereby effectively preventing HF from corroding the interior of the coating and the heat exchange tube. Meanwhile, due to the anti-corrosion coating with the specific composition of the present disclosure, the heat exchange tube of the present disclosure can be resistant to fluorine corrosion at a high temperature of 600° C. or more, and can be used at a rather high temperature of 1000° C. or more.