ANALISIS KEGAGALAN IMPELLER PENYEBAB KERUSAKAN POMPA AIR KAPAL LAUT
DOI:
https://doi.org/10.29122/mipi.v11i2.1621Abstract
Impeller merupakan bagian dari pompa sentrifugal yang digunakan  untuk kapal laut dan telah mengalami korosi seragam secara signifikan setelah satu tahun pengoperasian. Impeller terbuat dari ASTM B198-13A, grade C87400 yang merupakan jenis silicon brass. Hasil pemeriksaan visual menunjukkan bahwa seluruh permukaan kecuali pada bagian yang dilindungi oleh cat mengalami proses korosi di seluruh permukaan. Sedangkan pemeriksaan SEM menunjukkan adanya selective etching fasa-fasa tertentu. Hal pemeriksaan tersebut juga dikonfirmasi dengan pemeriksaan metalografi dimana menunjukkan adanya leaching dari fasa yang kaya akan unsur zinc mendekati zona terekspos. Oleh karena itu, mekanime korosi yang terjadi mengarah pada dezincfication. Analisis kimia dari material impeller menunjukkan bahwa material impeller yang diperiksa bukan jenis ASTM B584-836, namun agak mirip komposisi ASTM dimana merupakan jenis silicon brass dan merupakan jenis material kuningan yang tidak tahan serangan klorida tidak seperti leaded red brass.
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