korosi (7).pptx - TEKNOLOGI BAHAN DAN KOROSI By Tiara...

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TEKNOLOGI BAHAN DAN KOROSI By. Tiara Pradita
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CORROSION/KOROSI/PENGKARATAN kerusakan atau degradasi logam akibat reaksi redoks antara suatu logam dengan berbagai zat di lingkungannya yang menghasilkan senyawa-senyawa yang tidak dikehendaki
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Appeareance /Tampilan Maintenance and Operating /Pemeliharaan dan Operasi Plants shutdowns Contamination of Product /Kontaminasi Produk Product value /Harga produk Safety /Keselamatan Product liability /Tanggung Jawab Produk EFEK DARI KOROSI
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Faktor electrochemical Kontak langsung dengan O 2 dan H 2 O Kontak dengan elektrolit Mikroba Faktor Kimia dan Fisik Keberadaan zat pengotor pH FaktorTermodinamika Temperatur Faktor Metalurgi Permukaan Logam Galvanic Coupling FAKTOR PENYEBAB KOROSI
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PROSES TERJADINYA KOROSI
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KONTAK DENGAN ELETROLIT
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MIKROBA
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KEBERADAAN ZAT PENGOTOR
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pH 2H + (aq) + 2e - → H 2
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TEMPERATUR knalpot kendaraan bermotor yang mudah terkorosi akibat temperatur tinggi
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GALVANIC COUPLING Kemurnian logam yang rendah mengindikasikan banyaknya atom-atom unsur lain yang terdapat pada logam tersebut sehingga memicu terjadinya efek Galvanic Coupling , yakni timbulnya perbedaan potensial pada permukaan logam akibat perbedaan antara atom-atom unsur logam yang berbeda dan terdapat pada permukaan logam dengan kemurnian rendah. Efek ini memicu korosi pada permukaan logam melalui peningkatan reaksi oksidasi pada daerah anode.
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CORROSION or METALLURGY IN REVERSE Iron ore (iron oxide) metals Iron Oxide
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Wet Corrosion Dry Corrosion KLASIFIKASI KOROSI
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PRINSIP KOROSI
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KECEPATAN KOROSI Dimana, mpy = mils per year W = Weight Loss (g) D = Density of specimen (g/cm 3 ) A = Area of specimen (cm 2 ) T = Exposure time (hr)
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1.
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  • Summer '17
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