Novel surface pretreatment process of aluminum alloy with fluoride-free and ammonium-free formula

ZHANG Chao; LIU Qingfen; HUANG Xiaozhu; LIANG Xiangfeng; LI Wangliang; WANG Xiao; LIU Yinting; LIU Huizhou

doi:10.3969/j.issn.0438-1157.2014.09.034

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Novel surface pretreatment process of aluminum alloy with fluoride-free and ammonium-free formula

更新时间：2025-12-10

- Novel surface pretreatment process of aluminum alloy with fluoride-free and ammonium-free formula
- CIESC Journal Issue 9, Pages: 3559-3567(2014)
- 作者机构：
  
  中国科学院过程工程研究所, 绿色过程工程院重点实验室,北京,100190
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.09.034
  CLC： G17
- Online First：05 September 2014，
  
  Published：05 September 2014
- 稿件说明：
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ZHANG Chao, LIU Qingfen, HUANG Xiaozhu, et al. Novel surface pretreatment process of aluminum alloy with fluoride-free and ammonium-free formula[J]. CIESC Journal, 2014, (9): 3559-3567.
DOI：

ZHANG Chao, LIU Qingfen, HUANG Xiaozhu, et al. Novel surface pretreatment process of aluminum alloy with fluoride-free and ammonium-free formula[J]. CIESC Journal, 2014, (9): 3559-3567. DOI： 10.3969/j.issn.0438-1157.2014.09.034.

摘要

针对铝合金表面预处理过程存在污染严重、水耗高等问题，研究开发无氟无铵铝合金表面预处理新工艺。考察了碱性药剂配方组成及浓度、温度和时间对铝耗和铝合金表面形貌的影响，并通过正交实验确定了新工艺的优化方案。研究结果表明，经过“预处理-中和”两个步骤，铝合金表面平整、起砂细腻，铝耗仅为 2.0%。新工艺起砂效果优于传统碱蚀工艺，与传统酸蚀工艺细腻砂面相近。新工艺铝耗比传统碱蚀工艺降低约71%，与传统酸蚀工艺相近。新工艺操作时间比传统碱蚀工艺和酸蚀工艺分别缩短了23%和31%。最佳药剂配方为Na2CO3（80 g·L-1）， NaOH（8 g·L-1），Na2SO4（25 g·L-1）， Na3PO4（20 g·L-1）， SDS（0.6 g·L-1），甘油（5 g·L-1）。最佳操作条件为55℃和10 min。新工艺不仅从工艺源头消除了氟和氨氮污染，还实现了除油-起砂-去机械纹等多功能一体化集成。具有低污染、低铝耗、低水耗、短流程、高效率等优点，兼具环境友好和资源节约等优势。

Abstract

A novel aluminum alloy surface pretreatment process with fluoride-free and ammonium-free formula was developed. Through the two-step process of pretreatment etching-neutralizing

the aluminum alloy surface was smooth and had excellent sand finishing

the aluminum consumption was less than 2.0%. The sand finishing performance of the new process was better than that in the traditional alkaline-etching process

and was close to the traditional acid-etching process. The aluminum consumption of the new process was reduced by 71% compared with the traditional alkaline-etching process

and was close to the traditional acid-etching process. The process duration was 23% and 31% faster than the traditional alkaline-etching process and traditional acid-etching process

respectively. The optimum composition of the formula was: Na2CO3 (80 g·L-1)

NaOH (8 g·L-1)

Na2SO4 (25 g·L-1)

Na3PO4 (20 g·L-1)

SDS (0.6 g·L-1) and glycerol (5 g·L-1). The process was operated at 55℃ for 10 min. This process achieved following functions in one-step: degreasing

sand-finishing

surface mechanical lines-eliminating. This novel process has the advantages of lower pollution and water consumption

shorter process and higher efficiency

which is environment friendly and energy efficient.

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