Sac Malzemelerin Boyanabilme Kabiliyetlerine Temper Haddeleme Ezme Miktarının Etkisi

Year 2023, , 517 - 530, 15.06.2023

Batuhan Özakın , Emir Yılmaz

https://doi.org/10.31466/kfbd.1233154

Abstract

Boyalı çelik sac malzemelerin yüzeyleri otomotiv, beyaz eşya vb. sektörlerde ürünün son kalitesini ortaya koyduğundan tüketicinin dikkate aldığı önemli unsurlardan biridir. Bu sektörlerde kullanılan çelik sac malzemeler genellikle soğuk haddeleme üretim sürecinin son basamağında boyanabilme ve şekillendirme açısından pürüzlü olarak üretilir. Yüzeyde meydana gelen pürüzlülük profili sac malzemelerin boyanabilme kabiliyetini etkilemektedir. Aynı zamanda sac malzemelerin farklı pürüzlülüklerde temin edilebilmesinden dolayı yapışma mukavemetlerinin ve boyanabilme kabiliyetlerinin farklı olduğu ortadadır. Ayrıca yine haddeleme ve yüzey pürüzlülük parametreleri boya ve kaplamaların malzeme yüzeyine yapışma mukavemetini ve boyanabilme kabiliyetini etkilemektedir. Bu çalışmada HC420LA sac malzemelerin boyanabilme kabiliyetlerine temper haddeleme ezme miktarının etkisi araştırılmıştır. İlk olarak sac malzeme numuneleri farklı ezme miktarlarıyla temper haddeleme işlemine tabi tutulmuştur. Temper haddelenmiş HC420LA sac malzeme numunelerinin yüzeylerinin pürüzlülük parametreleri belirlenmiştir. Farklı ezme miktarları ile haddelenmiş ve farklı pürüzlülüklere sahip çelik sac malzemeler poliüretan akrilik esaslı boya ile kaplanmıştır. Son olarak boyanmış yüzeylerin yapışma mukavemetleri, dolayısıyla boyanabilme kabiliyetleri çapraz kesim (cross-cut) testinden elde edilmiştir. Temper haddeleme ezme miktarı arttıkça yüzeyin pürüzlülük profilinde değişimler meydana gelmiştir. Temper haddeleme ezme miktarı arttıkça (%0-1 aralığında) boyanın yapışma mukavemeti artmış ve %1 ezme miktarının üzerindeki artışlarda boyanın yapışma mukavemetinin azaldığı tespit edilmiştir. Tepelerin yüksekliklerinin (Rpk) ve vadilerin derinliklerinin (Rvk) boyanın yapışma mukavemetinde oldukça etkili olduğu sonucuna varılmıştır.

Keywords

Sac malzemeler, Temper haddeleme, Yüzey pürüzlülüğü, Boyanabilme kabiliyeti, Çapraz kesme (Cross-Cut) testi.

Supporting Institution

TÜBİTAK

Project Number

2209A

Thanks

Bu çalışma, TÜBİTAK 2209-A Üniversite Öğrencileri Araştırma Projeleri Destekleme Programı tarafından desteklenmiştir.

The Effect of Reduction Ratio of Temper Rolling on the Paintability of Sheet Materials

Abstract

Since the surfaces of painted steel sheet materials reveal the final quality of the product in sectors such as automotive, white goods, etc., it is one of the important factors that the consumer takes into account. Steel sheet materials used in these sectors are generally produced as rough in the last step of the cold rolling manufacturing process in terms of dyeability and shaping. The roughness profile on the surface affects the paintability of sheet materials. At the same time, since sheet materials can be supplied in different roughnesses, it is obvious that their adhesion strength and paintability are different. In addition, rolling parameters and surface roughness parameters affect the adhesion strength and paintability of paints and coatings to the material surface. In this study, the effect of reduction ratio of skin-pass rolling on the paintability of HC420LA sheet materials was investigated. Firstly, the sheet material samples were subjected to skin-pass rolling process with different crushing amounts. The roughness parameters of the surfaces of the skin-pass rolled HC420LA sheet material samples were determined. Steel sheet materials rolled with different crushing amounts and having different roughness are coated with polyurethane acrylic based paint. Finally, the adhesion strength of the painted surfaces, thus their ability to be painted, were obtained from the cross-cut test. As the reduction ratio of skin-pass rolling increased, changes occurred in the roughness profile of the surface. It was determined that the adhesion strength of the paint decreased as the reduction ratio of skin-pass rolling increased (in the range of 0-1%) and the adhesion strength of the paint increased with an increase above 1% reduction ratio. It was concluded that the peaks heights (Rpk) and valleys depths (Rvk) were highly effective on the adhesion strength of the paint.

Keywords

Sheet materials, Skin-pass (temper) rolling, Surface roughness, Paintability, Cross-Cut test

Project Number

2209A

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