Conversion Coatings Based on Rare Earth Nitrates and Chlorides for Corrosion Protection of Aluminum Alloy 7075-T6

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Pub Date : 2017-02-23 DOI:10.5006/2353

I. Milošev, Barbara Volarič

引用次数: 8

Abstract

Conversion coatings are expected to provide high corrosion protection and to be environmentally friendly at the same time. The aim of this study was to investigate rare earth (cerium and lanthanum) nitrate and chloride conversion coatings deposited on aluminum alloy AA7075-T6. Individual Ce and La nitrate and chloride coatings and their mixtures (Ce(NO3)3:La(NO3)3 and CeCl3:LaCl3) in the ratio 1:3 and 3:1 were studied. The properties of the coatings were investigated as a function of conversion bath parameters: conversion time (from 1 min to 12 h) and conversion temperature (room temperature and 60°C) at constant salt concentration of 0.01 M in the presence of 0.13 M hydrogen peroxide. The morphology and composition of the conversion coatings were analyzed using scanning electron microscopy and energy dispersive x-ray spectroscopy. The corrosion properties of uncoated and coated AA7075-T6 substrates were studied in 0.1 M NaCl using electrochemical potentiodynamic polarization method and salt spray testing...

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基于稀土硝酸盐和氯化物的7075-T6铝合金防腐转化涂层

转换涂层有望提供高腐蚀保护，同时对环境友好。本研究的目的是研究在铝合金AA7075-T6上沉积的稀土（铈和镧）硝酸盐和氯化物转化涂层。研究了Ce、La硝酸盐和氯化物涂层及其比例为1:3和3:1的混合物（Ce（NO3）3:La（NO3和CeCl3:LaCl3）。研究了涂层的性能作为转化浴参数的函数：在0.13M过氧化氢存在下，在0.01M的恒定盐浓度下，转化时间（从1分钟到12小时）和转化温度（室温和60°C）。利用扫描电子显微镜和能谱仪分析了转化涂层的形貌和组成。采用电化学动电位极化法和盐雾试验研究了未涂覆和涂覆的AA7075-T6基体在0.1M NaCl中的腐蚀性能。。。

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来源期刊

Corrosion MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion. 70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities. Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives: • Contribute awareness of corrosion phenomena, • Advance understanding of fundamental process, and/or • Further the knowledge of techniques and practices used to reduce corrosion.