Page 80 - 《精细化工》2020年第1期
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第 37 卷第 1 期                             精   细   化   工                                  Vol.37, No.1
             202 0 年 1 月                             FINE CHEMICALS                                 Jan.    2020


              功能材料
                  换热器表面复合涂层的制备及耐腐蚀与导热性能



                                                           *
                                       聂晟楠,吴俐俊 ,柳盈含,张   浩
                                       (同济大学  机械与能源工程学院,上海    201804)


                 摘要:为了提升换热器表面耐腐蚀性且不影响换热器的换热效果,以石墨烯、石墨粉末、环氧树脂等为原料,
                 制备了应用于换热器表面的耐腐蚀高导热石墨烯复合涂层。对涂层进行了硫酸腐蚀、导热、结合强度实验,结
                 果表明:涂层的耐腐蚀性能随石墨烯含量的增加而提升,当石墨烯质量分数达到 0.06%时,涂层的腐蚀速率达
                                  2
                                                                            2
                 最低值 0.2338 mg/(cm ·h),其耐腐蚀性能远强于 304 不锈钢的 1.500 mg/(cm ·h);涂层的导热性能随石墨粉含量
                 的增加而提升,且当石墨粉质量分数为 8%时达到最大值 35.848 W/(m·K);涂层的结合强度达到 ASTM 等级 5B。
                 关键词:换热器表面耐腐蚀;石墨烯;高导热;涂层;功能材料
                 中图分类号:TQ630.7      文献标识码:A      文章编号:1003-5214 (2020) 01-0066-06



                        Preparation, corrosion resistance and thermal conductivity of
                        graphene composite coating on the surface of heat exchanger


                                                            *
                                      Nie Shengnan, Wu Lijun , Liu Yinghan, Zhang Hao
                              (School of Mechanical Engineering, Tongji University, Shanghai 201804, China)

                 Abstract: In order to improve the surface corrosion resistance of heat exchanger without affecting its heat
                 transfer  efficiency,  graphene,  graphite  powder,  epoxy  resin,  and  other  materials  were  used  to  prepare  a
                 composite coating for high thermal conductivity and anti-corrosion on the surface of heat exchanger. After
                 sulfuric  acid  corrosion  test,  heat  conduction  test,  and  bonding  strength  test,  it  was  found  that  the  anti-
                 corrosion of the coating increased with the increase of graphene content. The corrosion rate of the prepared
                                                             2
                 coating reached a minimum value of 0.2338 mg/(cm ·h) when the mass fraction of graphene was 0.06%,
                 and  its  corrosion  resistance  was  much  stronger  than  that  of  304  stainless  steel  with  a  value  of
                            2
                 1.500 mg/(cm ·h).  Its  thermal  conductivity  increased  with  the  increase  of  graphite  powder  content,  and
                 reached a maximum value of 35.848 W/(m·K) when the mass fraction of graphite powder was 8%. The
                 bonding strength of the coating was up to ASTM grade 5B.
                 Key  words:  anti-corrosion  of  surface  of  heat  exchanger;  graphene;  high  thermal  conductivity;  coating;
                 functional materials


                 换热器是化工行业生产中应用广泛的热交换装                          瓷涂层虽然耐腐蚀,但是导热系数低影响换热,且
            置,但换热器在实际应用中普遍面临严重的腐蚀问                             线膨胀系数小,容易发生瓷崩;高合金基材则成本
            题。以省煤器       [1-2] 为例,烟气中的 SO 2 、SO 3 等硫化          太高,大量运用在生产装置上不现实。因此,迫切
            物在低于露点温度时产生的硫酸会对省煤器表面产                             需要研究一种新型表面复合涂层,能同时满足换热
            生腐蚀,危害极大。对于这些问题,目前主要采取                             器表面耐腐蚀与高导热等性能要求。
            定期人工翻排检修         [3-4] 、涂覆陶瓷涂层或采用高合金                   单纯的树脂涂层一般无法满足防护涂层耐腐
            基材等措施应对,虽然一定程度上可以解决腐蚀问                             蚀、高导热等性能的要求,利用其他无机材料和树
            题,但人工检修工作量大,严重影响正常生产;陶                             脂混合成的复合树脂涂层可以有效解决这一问题。

                 收稿日期:2019-04-28;  定用日期:2019-07-18; DOI: 10.13550/j.jxhg.20190372
                 基金项目:国家自然科学基金(51574179)
                 作者简介:聂晟楠(1997—),男,硕士生,E-mail:2283591867@qq.com。联系人:吴俐俊(1965—),男,教授,E-mail:
                 ljwu@tongji.edu.cn。
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