铝制板翅式换热器表面锌扩散防腐处理研究.pdf

试验研究
铝制板翅式换热器表面锌扩散防腐处理研究
王真,张锐',张正国
(1.佛山神威热交换器有限公司技术工程中心,广东佛山52800032.华南理工大学传热强化与
过程节能教育部重点实验室,广东广州510640)
摘要:铝制板翅式换热器内外通道具有复杂的翅片结构,孔蚀已成为铝制板翅式换热器泄漏的主
要原因,几种专业的表面镀锌防腐处理效果不佳,影响了铝制板翅式换热器在更大范围的推广使
用。对一种新型的表面锌扩散防腐处理方法应用于铝制板翅式换热器的工艺进行了研究,经过铧
扩散工艺处理,锌原子能扩散至换热器母材内层,形成锌铝合金层,在母材内部距表面100μm深
度处铧含量可达0.49%。热扩散温度与时间是影响铧扩散的主要因素,当工艺操作温度恒定,时
间越长,锌扩散的深度和锌含量就越大。经过锌扩散处理的铝制板翅式换热器耐蚀试验结果表明,
锌铝合金层具有优良的防腐蚀效果。
关键词;铝制板翅式換热器;锌扩散;防腐处理
中图分类号:TH49;TK124:T0050.9文献标识码:A文章编号:1001-4837(2012)08-0001-05
doi:10.3969/j.issn.1001-4837.2012.08.001
Research for Aluminum Plate-fin Heat Exchanger Surface Zinc
Idiffusion Antl-corrosive Treatment
WANG Zhen-yong', ZHANG Rui, ZHANG Zheng-guo
(1. Foshan KAMUI Heat-exchanger Co., Ltd. Technology Engineering Center, Foshan 528000, Chi-
na 2 Key aboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, South
China University of Technology, Guangzhou 510640,China)
Abstract: The internal and external channel of the plate-fin heat -exchanger has a complex fin struc-
ture. Pitting corrosion has become the main reason of the plate-fin heat exchanger leakage. The effect of
several profession surface galvanized anti-corrosion processing methods are proved invalid. For this rea
son, the plate-fin heat exchanger cant be used in the wider field. The author discusses a new method of
surface zinc diffusion anti-corrosive processing and how to applied it to the plate-fin heat-exchanger
technology. After zinc thermal diffusion process, zinc atomic can diffuse to heat-exchanger inner mater
als and form zinc-alloy layer. In the main material, the place to the surface in internal 100 wm the
depths zinc density can amount to 0.49% Thermal diffusion emperature and time are the main factors of
influence zinc diffusion. When operation temperature constant and time longer, the depth and density of
spread zinc will be greater. After zi i usion atment, the plate-fin heat exchanger corrosion test re-
sults show that the zinc alloy layer with excellent anti-corrosion effect
基金项目:科技部技术创新基金项目(09c26214402095);广东省重大科技计划项目(2011A080804005)