Analisis Kekuatan Adhesif dan Ketahanan Cathodic Disbonding pada Baja ASTM A36 dengan Variasi Jenis Material Abrasif

Prasetyo, Gerry (2018) Analisis Kekuatan Adhesif dan Ketahanan Cathodic Disbonding pada Baja ASTM A36 dengan Variasi Jenis Material Abrasif. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini berfokus kepada pengaruh jenis material abrasif terhadap kekasaran permukaan yang dihasilkan setelah proses sand blasting dan ketahanan kualitas dari pelapisan dalam perlindungan terhadap laju korosi yang diterapkan pada baja A36. Kekasaran permukaan baja dihasilkan dari 6 variasi jenis material abrasif yang telah umum digunakan baik dalam bentuk grit (steel grit, alumunium oxide, volcanic ash) maupun dengan bentuk shot (garnet, glass beads, silica sand). Parameter kekasaran permukaan (Rz) telah diukur lima titik pada permukaan spesimen. Penelitian ini menemukan perbedaan antara hasil sand blasting material abrasif berbentuk grit dengan bentuk shot. Pelapisan pada substrat dengan material abrasif jenis steel grit menunjukkan pull-off strength lebih tinggi dari variasi yang lain. Pengujian immerse dilakukan dengan metode scratch selebar 1 mm pada permukaan lapisan lalu saat evaluasi dari pengujian dilakukan pengukuran pelebaran scratch yang terjadi. Hasil dari senyawa produk korosi saat pengujian immerse telah dianalisis menggunakan XRD. Pengujian cathodic disbonding mengacu pada standar ASTM G8 metode B dengan tegangan proteksi katodik sebesar -1,5 sampai -1,6 V. Cacat blistering dan peningkatan nilai pH pada larutan dihasilkan pada pengujian cathodic disbonding. Kualitas dari pelapisan juga berkurang setelah pengujian cathodic disbonding dibuktikan dengan hasil pull-off strength yang menurun. Perbandingan ukuran dan kuantitas dari blistering setiap variasi spesimen telah dievaluasi. Hasil dari penelitian ini menunjukkan bahwa meningkatnya kekerasan jenis material abrasif akan meningkatkan kekasaran pada permukaan baja dan kekuatan adhesif. Dengan meningkatnya tingkat kekasaran permukaan maka kualitas dari pelapisan yang digunakan terhadap baja semakin baik. ================= This study focuses on the effect of abrasive material type on surface roughness produced after sand blasting process and quality resistance of coating in protection against corrosion rate applied to steel A36. Substrate roughness is resulted from the 6 variation of abrasive materials types that have been commonly used both in the form of grit (steel grit, aluminum oxide, volcanic ash) and with the shape shot (garnet, glass beads, silica sand). The surface roughness parameter (Rz) has been measured five points on the surface of the specimen. This study found the difference between the sand blasting of abrasive grit-shaped material with the shape of shot. Coatings on substrates with steel-grit abrasive material exhibits higher pull-off strength than other variations for both primer and for top coat. The immersion of the specimen was performed by 1 mm wide scratch method on the surface of the layer and then when the evaluation of the test was carried out the scratch widening measurements took place. The results of the corrosion product compounds during the immerse test have been analyzed using XRD. The cathodic disbonding test refers to the ASTM G8 method B standard with a cathodic protection voltage of -1.5 to -1.6 V. Blistering and increased pH values resulted in cathodic disbonding testing, but cathodic delamination was not found. The quality of the coating is also reduced after cathodic disbonding is evidenced by the decreased pull-off strength. A comparison of the size and quantity of the blistering of each specimen variation has been evaluated. The results of this study indicate that increased hardness of abrasive type of material will increase the roughness of the steel surface and adhesive strength. With increasing surface roughness, the quality of the coating used in the steel is better.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Material Abrasif, Preparasi Permukaan, Kekuatan Adhesif, Cathodic Disbonding, Blistering, Abrasive Materials, Surface Preparation, Adhesion Strength, quality of the coating, corrosion
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives
T Technology > TA Engineering (General). Civil engineering (General) > TA491 Metal coating.
T Technology > TS Manufactures
T Technology > TS Manufactures > TS699 Powder coating of metals
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: Prasetyo Gerry
Date Deposited: 24 Oct 2018 01:37
Last Modified: 24 Oct 2018 01:37
URI: http://repository.its.ac.id/id/eprint/52785

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