Pengaruh Perlakuan Awal Terhadap Hasil Pelapisan Powder Coating, Serta Pengujian Kualitas Dengan Menggunakan Salt Spray Test

Rakhmadi, Adhie (2008) Pengaruh Perlakuan Awal Terhadap Hasil Pelapisan Powder Coating, Serta Pengujian Kualitas Dengan Menggunakan Salt Spray Test. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

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. Pretreatment 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 B1 17 selama 168 jam. Kualitas hasil pengecatan powder coating diukur dari parameter -parameter perubahan berat, ketebalan cat dan perubahan fisik Ketiga parameter terse but 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 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 dopa! 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
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Painting is a method of coating metal to protect against corrosion. A layer of paint attached to the metal will separate direct contact between the metal and the environment, thus minimizing the risk of corrosion. In its application, there are various types of paint that are distinguished by their type, namely organic and non-organic. In addition, according to the differences in form, there are several types, including powder paint (powder coating) and liquid paint. In the powder coating painting process, it begins with an initial treatment (pre-treatment) which generally includes acidic cleaning and zinc phosphating. In this study, the effect of different pre-treatments on the quality of powder coating painting on steel was studied. Complete pretreatment was carried out on specimens of method 1, acidic cleaning without zinc phosphating process was carried out on specimens of method 2 and for specimens of method 3 no pre-treatment was given at all. Aluminum painting without pre-treatment was also given to specimens of method 4 to be compared with method 3. The quality of the painting results will be tested using a salt spray test according to ASTM standard B1 17 for 168 hours. The quality of powder coating results is measured from the parameters of weight change, paint thickness and physical changes. These three parameters are at the end of each 24-hour salt spray test. The formation of corrosion products is the result of the corrosion reaction of the metal protected by a salt solution that is able to penetrate the paint layer. From this study, the best coating quality is shown in steel that has undergone complete pre-treatment (method 1), where the weight change and corrosion attack that occurs are the least. In specimens of method 2 that do not go through the zinc phosphating process, the greatest weight change occurs because of the large amount of corrosive media that diffuses into the paint layer. Corrosion attacks that occur are mostly found on the edges of the specimen. In steel that does not use pre-treatment (method 3) produces a smaller weight change compared to specimens of method 2. Application without dopa! pre-treatment produces better quality in the use of aluminum material (method 4). The thickness of the paint did not change significantly during the salt spray test using all methods, indicating that the paint was not dissolved by the corrosive medium

Item Type:	Thesis (Other)
Additional Information:	RSM 667.9 Adh p-1 2008 (weeding)
Uncontrolled Keywords:	powder coating, pre-treatment, salt spray test, korosi; powder coating, pre-treatment, salt spray test, corrosion
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.9.C57 Coatings
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	EKO BUDI RAHARJO
Date Deposited:	02 Jan 2026 06:31
Last Modified:	02 Jan 2026 06:31
URI:	http://repository.its.ac.id/id/eprint/129202

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