Investigasi Umur Fatik Aluminium 7075-T7 Yang Mengalami Korosi Air Laut
DOI:
https://doi.org/10.23960/mech.v14i2.3681Abstract Views: 227 File Views: 145
Keywords:
korosi, air laut, Al 7075Abstract
Abstrak
Penelitian ini bertujuan menginvestigasi umur fatik paduan Al 7075-T7 yang telah terkorosi air laut yang mengadung 3.5% garam NaCl. Pengujian laju korosi dilakukan dengan merendam spesimen ke dalam air laut yng dikondisikan bergerak secara siklon pada kecepatan putar konstan 600 rpm selama 168 jam. Uji fatik dilakukan pada 3 level pembebanan yang berbeda dengan frekuensi sama (f = 10 Hz) untuk spesimen yang terkorosi selama 24 jam dan 48 jam. Uji perambatan retak dilakukan untuk spesimen yang terkorosi selama 24 jam dan tidak terkorosi. Hasil menunjukan bahwa spesimen yang terkorosi air laut mengalami signifikan penurunan umur fatik. Selain itu spesimen yang terkorosi juga mengalami peningkatan laju perambatan retak fatik. Interaksi korosi awal dan pembebanan fatik, dimana pembentukan endapan partikel presipitasi yang mengandung elemen logam Cu, Fe, Mn, Zn, dan Mg yang terbentuk dalam batas butir dan matriks alumnium dipercaya menjadi pemicu mekanisme korosi galvanis. Patah belah yang dialami oleh matriks dan partikel presipitasi serta striasi ditemukan pada spesimen yang terkorosi mengungkapkann bahwa mekanisme perambatan retak fatik menjadi lebih kompleks.
Kata kunci: Al 7075, korosi air laut, korosi fatik, perambatan retak, presipitasiDownloads
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