利用熱解重量分析儀研究了鋁鎂合金在干濕環(huán)境中的熱氧化，并用質(zhì)譜儀分析了廢氣的成分。結(jié)果發(fā)現(xiàn)當(dāng)水蒸氣參與氧化的時候，有氫氣產(chǎn)生。濕潤環(huán)境（7%摩爾水）并不影響總氧化量，但似乎促進了在空氣中和含5%二氧化碳的空氣中的氧化。在含5%二氧化碳的空氣中的氧化要比在純空氣中的氧化減少50-75%。有些試樣在含5%二氧化碳的濕潤空氣中（7%摩爾水）沒有顯著氧化，這可能是由于在液態(tài)鋁試樣周圍形成了強氧化層。碳粉涂層可以保護鋁不被氧化，與沒有碳粉涂層的試樣相比，碳粉涂層延長了鋁不發(fā)生氧化的時間，而且潮濕又加強了這種保護。這一研究在工業(yè)熱脫涂層裝置中有潛在的應(yīng)用前景。
原文：
OXIDATION OF AlMg IN DRY AND HUMID ATMOSPHERES
Darcy Stevens1, Anne Kvithyld1, Thorvald Abel Engh2, Shawn Wilson1
1SINTEF Materials and Chemistry, Trondheim, N-7465, Norway
2Norwegian University of Science and Technology, Trondheim, NO-7491, Norway
Keywords: aluminum, oxidation, carbon residue, humid atmospheres
Abstract
Thermal oxidation of Al5%Mg was carried out in dry and humid atmospheres with a thermogravimetric analyzer (TGA), and the composition of off-gases was measured with a mass spectrometer. It was found that when water vapor participates in oxidation, hydrogen gas is produced. A humid atmosphere (7 mol% H2O) does not affect total oxidation mass, but seems to catalyze
oxidation in both air and air containing 5 mol% CO2. In an air atmosphere containing 5 mol% CO2, total oxidation is approximately 50-75 % less than in air alone. Some samples in humid air (7 mol% H2O) containing 5 % CO2 did not oxidize significantly, which may be due to a strong oxide layer which forms around the liquid aluminum sample. A carbon powder coating was shown to protect the aluminum from oxidation for an extended period of time compared to an unprotected sample and
humidity extended this protection. This work has potential applications in industrial thermal decoating units.
作者：Darcy Stevens 等，挪威
原文：
OXIDATION OF AlMg IN DRY AND HUMID ATMOSPHERES
Darcy Stevens1, Anne Kvithyld1, Thorvald Abel Engh2, Shawn Wilson1
1SINTEF Materials and Chemistry, Trondheim, N-7465, Norway
2Norwegian University of Science and Technology, Trondheim, NO-7491, Norway
Keywords: aluminum, oxidation, carbon residue, humid atmospheres
Abstract
Thermal oxidation of Al5%Mg was carried out in dry and humid atmospheres with a thermogravimetric analyzer (TGA), and the composition of off-gases was measured with a mass spectrometer. It was found that when water vapor participates in oxidation, hydrogen gas is produced. A humid atmosphere (7 mol% H2O) does not affect total oxidation mass, but seems to catalyze
oxidation in both air and air containing 5 mol% CO2. In an air atmosphere containing 5 mol% CO2, total oxidation is approximately 50-75 % less than in air alone. Some samples in humid air (7 mol% H2O) containing 5 % CO2 did not oxidize significantly, which may be due to a strong oxide layer which forms around the liquid aluminum sample. A carbon powder coating was shown to protect the aluminum from oxidation for an extended period of time compared to an unprotected sample and
humidity extended this protection. This work has potential applications in industrial thermal decoating units.
作者：Darcy Stevens 等，挪威
