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首页> 外文期刊>Journal of Applied Polymer Science >Polyimide-polyurea copolymer coating with outstanding corrosion inhibition properties
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Polyimide-polyurea copolymer coating with outstanding corrosion inhibition properties

机译：聚酰亚胺 - 聚脲共聚物涂层具有出色的腐蚀性抑制性能

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摘要

A novel class of copolymers containing polyimide and polyurea blocks with unique physical properties and capable of providing effective protection to aluminum alloy 2024-T3 substrate against corrosion has been prepared. The structure and properties of polyurea-b-polyimide (PUI) copolymers were controlled by varying the co-monomer concentration. The PUI block copolymer can reorganize into a supra-molecular structure by forming intra-and inter-hydrogen bonding interactions between adjacent copolymer chains, resulting in a dense and compact structure capable of protecting the imide ring from hydrolysis when exposed to a corrosive environment. Apart from minimized surface hydrolysis, the establishment of compacted morphology also leads to a drastically improved barrier property and reduced diffusivity. The corrosion rate and polarization resistances of PUI-coated aluminum alloys were measured by using direct current polarization technique. Increasing polyurea concentration resulted in a remarkable decrease in diffussivity and surface energy, consistent with the measured remarkable increase in the coatings durability and corrosion performance. Corrosion inhibition tests were carried out for more than 30 weeks in a saturated NaCl solution containing 3.5 wt % of salt. (C) 2017 Wiley Periodicals, Inc.
机译：已经制备了一种具有独特物理性质的聚酰亚胺和聚脲嵌段的新型共聚物，并且能够为耐腐蚀提供有效的铝合金2024-T3基板。通过改变共聚单体浓度来控制聚脲-B-聚酰亚胺（PUI）共聚物的结构和性质。通过在相邻的共聚物链之间形成和氢氢键合相互作用，可以通过在相邻的共聚物链之间形成和紧凑的结构来重新组织β-分子结构，导致能够在暴露于腐蚀性环境时保护酰亚胺环免受水​​解的致密和紧凑的结构。除了最小化的表面水解外，压实形态的建立还导致抗屏障性和扩散性降低。通过使用直流偏振技术测量普洱涂覆铝合金的腐蚀速率和偏振电阻。增加的聚脲浓度增加了膨胀性和表面能的显着降低，与涂层耐久性和腐蚀性能的测量显着增加一致。在含有3.5wt％盐的饱和NaCl溶液中进行腐蚀抑制试验超过30周。 （c）2017 Wiley期刊，Inc。

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