( 1. 中國科學院 金屬研究所 金屬腐蝕與防護國家重點實驗室, 沈陽 110016;
2. 長春工業(yè)大學 材料工程系, 長春 130012)
摘 要: 在溫度為298K， 相對濕度為(85±5)%的條件下， 對硫酸銨和氯化銨兩種鹽沉積后的LY12鋁合金大氣腐蝕行為進行了研究。 腐蝕動力學曲線表明：沉積硫酸銨和氯化銨的LY12樣品比空白樣品的腐蝕更為嚴重，而且經(jīng)氯化銨沉積的樣品比經(jīng)硫酸銨沉積的樣品腐蝕嚴重得多。 采用傅里葉變換紅外光譜、 掃描電鏡以及光電子能譜等微觀方法研究了不同腐蝕周期樣品表面的結(jié)構(gòu)和形貌， 結(jié)果表明腐蝕主要沿著鹽沉積的區(qū)域進行，隨著時間的延長， 腐蝕產(chǎn)物的生成減緩了LY12合金的腐蝕質(zhì)量損失。對兩種鹽沉積條件下LY12合金的腐蝕機理進行了討論。
關(guān)鍵字: LY12鋁合金；鹽沉積； 大氣腐蝕
（ 1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research,
The Chinese Academy of Sciences,
Shenyang 110016, China;
2. Department of Materials Engineering,
Changchun University of Technology, Changchun 130012, China）
Abstract: The atmospheric corrosion of LY12 alloy deposited with (NH4)2SO4 and NH4Cl particles was investigated at 298K with relative humidity of (85±5)%. The results show that: the samples deposited with NH4Cl particles corrode more seriously than the samples with (NH4)2SO4 particles. FTIR, SEM and XPS were utilized to study the development of corrosion process and characterization of corrosion products. The results also indicate that LY12 alloy contaminated by salts is corroded much faster than the clean samples, and corrosion of LY12 alloy initiates along the deposition area of (NH4)2SO4 and NH4Cl particles. A corrosion mechanism was proposed to explain the observation
Key words: LY12 alloy; deposition; atmospheric corrosion
