イトロ処理を適用した航空機アルミニウム合金塗装の強度と耐環境性

Material type: 文書・図像類

Author: 安岡, 哲夫ほか

Publisher: 宇宙航空研究開発機構(JAXA)

Publication date: 2021-01-22

Material Format: Digital

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Note (General)：: イトロ処理法は，有害な化学物質を排出せず，高速処理可能かつ自動化可能であるため，航空機塗装における新たな塗装前表面処理となる可能性を有している．本研究では，アルミニウム合金基材にイトロ処理法を適用した場合の表面分析，塗装後の初期の塗膜付着強度評価，短期的および長期的な塗装の耐環境性評価を行った．基材...

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Material Type: 文書・図像類
Title: イトロ処理を適用した航空機アルミニウム合金塗装の強度と耐環境性
Author/Editor: 安岡, 哲夫
竹田, 智
YASUOKA, Tetsuo
TAKEDA, Tomo
Author Heading: 安岡, 哲夫
竹田, 智
YASUOKA, Tetsuo
TAKEDA, Tomo
Publication, Distribution, etc.: 宇宙航空研究開発機構(JAXA)
Publication Date: 2021-01-22
Publication Date (W3CDTF): 2021-01-22
Alternative Title: Strength and environmental durability of aircraft coatings on an aluminum alloy with ITRO treatment
Periodical title: 宇宙航空研究開発機構研究開発報告 = JAXA Research and Development Report
No. or year of volume/issue: JAXA-RR-20-003
Volume: JAXA-RR-20-003
Pages: 1-14
ISSN (Periodical Title): ISSN : 2433-2216
Text Language Code: jpn
Subject Heading: Surface treatment
Adhesion
Aluminum alloy
Pull-off tests
Aircraft coatings
Target Audience: 一般
Note (General): イトロ処理法は，有害な化学物質を排出せず，高速処理可能かつ自動化可能であるため，航空機塗装における新たな塗装前表面処理となる可能性を有している．本研究では，アルミニウム合金基材にイトロ処理法を適用した場合の表面分析，塗装後の初期の塗膜付着強度評価，短期的および長期的な塗装の耐環境性評価を行った．基材の表面分析として電子顕微鏡観察およびフーリエ変換赤外分光法を行った．基材表面にはナノ粒子が付着していること，二酸化ケイ素，水，シラノール基が存在すること，それらの量は処理回数を増やすと増加すること，の3点が明らかとなった．塗膜付着強度評価はプルオフ試験により行った．初期状態では，イトロ処理を適用したテストピースのプルオフ強度は脱脂のみの場合および火炎処理の場合に比べて高く，1回の処理でベンチマークであるアノダイズ処理に匹敵する強度を発現した．短期的な耐環境性評価として日本産業規格に基づく耐加熱性試験，耐湿性試験，耐湿潤冷熱繰返し性試験を行った．その結果，塗装テストピースに塗膜の膨れ等は認められず，十分な耐環境性を有することが示された．長期的な耐環境性評価として，600日間室内暗所に保管した塗装テストピースのプルオフ試験を行った．その結果，イトロ処理を適用したテストピースのプルオフ強度は初期強度の40%程度まで低下した．しかし，保管後のテストピースを125度Cで真空加熱すると，初期強度と同等レベルまで回復した．
ITRO treatment has potential to be an innovative surface treatment for aircraft coatings because the treatment can be rapid, automated and clean. In this study, the surface conditions of aluminum alloy substrates with ITRO treatment, the initial adhesion strength of coated test pieces with ITRO treatment, and short-term and long-term environmental durability of coated test pieces were investigated. Scanning electron microscopy and Fourier transform infrared spectroscopy were performed for analyzing substrate surfaces after ITRO treatment. Three points were revealed from the analyses: nanoparticles adhered to the surfaces; silicon dioxide, water, and silanol groups were contained on the surfaces; the amount of those chemicals on the surfaces increased with the number of treatments. Adhesion strength of coatings was evaluated by means of pull-off tests. As a result of the tests at initial conditions, the pull-off strength of coated test pieces with ITRO treatment was higher than that with only degreasing and with a flame treatment. Furthermore, just one-time ITRO treatment resulted in high strength comparable to that with a benchmark treatment, that is, a chromic acid anodizing treatment. Short-term environmental durability was evaluated by means of testing in Japanese Industrial Standards: heating tests, humidity tests, and hot wet and cold cycling tests. As a result, blistering or other defects was not observed on coated test pieces, in other words, they had sufficient environmental durability. Long-term environmental durability was evaluated by means of pull-off tests using coated test pieces stored in a dark place at room temperature for 600 days. The pull-off strength after long-term storage dropped to 40% of the initial strength. However, the pull-off strength recovered to the equivalent level to the initial strength after exposing the stored test pieces to vacuum and heat conditions at 125 C.
形態: カラー図版あり
Physical characteristics: Original contains color illustrations
資料番号: AA2030007000
レポート番号: JAXA-RR-20-003
DOI: 10.20637/00047284
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ