CaCO_3在Cu基Ni-P-PTFE化学复合镀表面结垢行为及分形评价的研究

Investigation of CaCO 3 scaling movement on surface of electrolessNi P PTFE composite coatings based on Cu and fractal evaluation

对化学镀Ｎｉ－Ｐ－ＰＴＦＥ换热面进行了模拟循环冷却水中ＣａＣＯ３的结垢实验研究．结果表明，当换热面上有解吸空气泡时，该表面结垢较Ｃｕ面加剧；无解吸空气泡时，结垢减轻．并运用分形理论对结垢行为进行了评价，发现化学镀表面垢形之分维值较Ｃｕ面的增大了．

The CaCO 3 scaling in simulating cooling water system was investigated on the heat transfer surface of electroless Ni P PTFE based on Cu. The results indicate that the scaling process is enhanced when the air bubbles are desorbed on the Ni P PTFE surface and reduced when no air bubbles exist on the Ni P PTFE surface. The fractal theory is used to analyze the scaling geometric texture. The results show that the fractal dimension value D of CaCO 3 fouling on the Ni |P PTFE surface is greater than that on Cu surface.