Thermal studies on electrodeposited black oxide coating on magnesium alloys

被引：48
|
作者：
Sharma, AK [1 ]
Rani, RU
Mayanna, SM
机构：
[1] ISRO Satellite Ctr, Thermal Syst Grp, Bangalore 560017, Karnataka, India
[2] Bangalore Univ, Dept Chem, Bangalore 560001, Karnataka, India
来源：
THERMOCHIMICA ACTA | 2001年 / 376卷 / 01期
关键词：
thermoanalytical behavior; anodic coatings; magnesium alloys; thermal emittance; space applications;
D O I：
10.1016/S0040-6031(01)00534-2
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Thermal behavior of black anodic coatings on magnesium alloy, AZ31B and magnesium lithium alloy, MLA 9 has been investigated. The chemical nature of coating is characterized by infrared spectral studies. The thermoanalytical investigations have been carried out using thermogravimetry (TG), derivative thermogravimetry (DTG), and differential scanning calorimetry (DSC). The decomposition proceeds through three steps viz., dehydration, decomposition of chromium hydroxide and sulphate and decomposition of magnesium chromate to oxide. Measurement of hemispherical emittance of coatings verses temperature was investigated using calorimetric methods. The studies revealed that the thermal emittance of coatings increases with temperature. Cc) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：67 / 75
页数：9
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