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ITS » Undergraduate Theses » Teknik Mesin
Posted by dewi007 at 05/12/2008 10:30:00  •  5897 Views


PENGARUH PERLAKUAN AWAL TERHADAP HASIL PELAPISAN POWDER COATING SERTA PENGUJIAN KUALITAS DENGAN MENGGUNAKAN SALT SPRAY TEST

THE INFLUENCE OF PRE-TREATMENT FOR POWDER COATING AND QUALITY TEST BY SALT SPRAY

Author :
ADHIE RAKHMADI 




ABSTRAK

Pengecatan merupakan salah satu cara pelapisan pada logam dalam usaha perlindungan terhadap serangan korosi. Lapisan cat yang menempel pada logam akan memisahkan kontak langsung antara logam dengan lingkungan sehingga resiko terjadinya serangan korosi dapat diminimalkan. Pada aplikasinya terdapat bermacam - macam cat yang dibedakan menurut jenisnya yaitu organic dan non-organic. Selain itu menurut perbedaan wujud terdapat beberapa macam antara lain cat bubuk powder coating dan cat cair. Pada proses pengecatan powder coating sebelumnya dimulai dengan perlakuan awal pre-treatment yang umumnya meliputi acidic cleaning dan zinc phospathing. Pada penelitian ini dipelajari pengaruh pre-treatment yang berbeda terhadap kualitas pengecatan powder coating pada baja. Pre-treatment lengkap dilakukan pada spesimen metode 1 acidic cleaning tanpa proses zinc phospathing dilakukan pada spesimen metode 2 dan untuk spesimen metode 3 tidak diberikan pre-treatment sama sekali. Pengecatan aluminium tanpa pre-treatment juga diberikan pada spesimen metode 4 untuk dibandingkan dengan metode 3. Kualitas hasil pengecatan akan diuji menggunakan salt spray test sesuai ASTM standart B117 selama 168 jam. Kualitas hasil pengecatan powder coating diukur dari parameter - parameter perubahan berat ketebalan cat dan perubahan fisik. Ketiga parameter tersebut pada setiap akhir 24 jam pengujian salt spray. Terbentuknya produk korosi merupakan hasil dari reaksi korosi logam yang dilindungi dengan larutan garam yang mampu menembus lapisan cat. Dari penelitian ini kualitas coating yang terbaik ditunjukkan pada baja yang mengalami pre-treatment lengkap metode 1 dimana perubahan berat dan serangan korosi yang terjadi paling sedikit. Pada ii spesimen metode 2 yang tidak melewati proses zinc phospathing terjadi perubahan berat yang paling besar karena banyaknya media korosif yang berdifusi ke dalam lapisan cat. Serangan korosi yang terjadi banyak ditemui pada tepi - tepi spesimen. Pada baja yang tidak menggunakan pre-treatment metode 3 menghasilkan perubahan berat yang lebih kecil dibandingkan dengan spesimen metode 2. Aplikasi tanpa pre-treatment dapat menghasilkan kualitas yang lebih baik pada penggunaan material aluminium metode 4. Ketebalan cat tidak mengalami perubahan signifikan selama pengujian salt spray pada semua metode hal ini menunjukkan bahwa cat tidak larut oleh media korosif.


ABSTRACT

Painting is one of any methods on metals coated to protect it from corrosion attack. Paint layer caused lost contact between metal with its environment so it can decrease corrosion risk. In their implementation therere many kind of paint based on type and appearance. The most used is liquid paint and beside it theres the other paint which has solid appearance with powder size called powder coating. This research studied influence of different pre-treatment of powder coated quality on steel. The first second and third methods used mild steel as its specimen. The first method used full treatment. The second one only cleaned by HCl that was called acidic cleaning. So the second method didnt use zinc phospathing after acidic cleaning. Both of third and fourth methods didnt use pre-treatment but the fourth method used aluminum for its specimen The product quality tested by salt spray it based on ASTM Standart B-117 with total time 168 hours. It was devided became 7 periods so every period consist of 24 hours. The result of the end of each period were weight change paint layer thickness and visual appearance that showed the product quality. From this research obtained the best pre-treatment application for steel is specimen with full treatment first method it has the least weight change and the smallest corrosion attack. Next are specimen without pre-treatment third method and specimen without zinc phospathing second method. Until end of test theres no paint layer thickness change it showed that paint layer was insoluble by salt spray iv test. Aluminum with its oxide layerfourth method has better corrosion resistance than steelthird method although it didnt use pre-treatment.



Keywordspowder coating; pre-treatment; salt spray test; korosi
 
Subject:  Lapisan bahan
Contributor
  1. Dr. Ir. H.C. Kis Agustin, DEA
Date Create: 05/12/2008
Type: Text
Format: pdf.
Language: Indonesian
Identifier: ITS-Undergraduate-3100008031785
Collection ID: 3100008031785
Call Number: RSM 667.9 Adh p


Source
Undergraduate Theses of Mechanical Engineering, RSM 667.9 Adh p, 2008

Coverage
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Copyright @2008 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library




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ITS-Undergraduate-3100008031785-2678.pdf




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