The effect of post-treatment time and temperature on cerium-based conversion coatings on Al 2024-T3

被引：96

作者：

Heller, Daimon K. ^{[1
]}

Fahrenholtz, William G. ^{[1
]}

O'Keefe, Matthew J. ^{[1
]}

机构：

[1] Missouri Univ Sci & Technol, Rolla, MO 65409 USA

来源：

CORROSION SCIENCE | 2010年 / 52卷 / 02期

关键词：

Aluminum; Rare earth elements; XPS; EIS; Pitting corrosion; Oxide coatings; ALUMINUM-ALLOY; CORROSION-RESISTANCE; OXYGEN REDUCTION; INHIBITION; SURFACE; NANOCRYSTALLINE; PROTECTION; DEPOSITION; XPS;

D O I：

10.1016/j.corsci.2009.09.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Corrosion performance, morphology, and electrochemical characteristics of cerium-based conversion coatings on Al 2024-T3 were examined as a function of phosphate post-treatment time and temperature. Corrosion resistance improved after post-treatment in 2.5 wt.% NH4H2PO4 for times up to 10 min or temperatures up to 85 degrees C. Electrochemical impedance spectroscopy and polarization testing correlated to neutral salt spray corrosion performance. Hydrated cerium oxide and peroxide species present in the as-deposited coatings were transformed to CePO4 center dot H2O for post-treatments at longer times and/or higher temperatures. Based on these results, processes active during post-treatment are kinetically dependent and strongly influenced by the post-treatment time and temperature. (c) 2009 Elsevier Ltd. All rights reserved.

引用

页码：360 / 368

页数：9

共 27 条

[1]

[Anonymous], [No title captured]

[2]

[Anonymous], [No title captured]

[3] Corrosion protection of magnesium alloys by cerium, zirconium and niobium-based conversion coatings [J].