AKIMSIZ KAPLAMA YÖNTEMİYLE NİKEL ESASLI METALİK KAPLAMALARIN ÜRETİMİ

Endüstriyel ortamda ve zorlu çevre koşullarında çalışan metal malzemelerin yüzeyleri zamanla ortamdaki etkenlere bağlı olarak bozulmaktadır. Yüzeyi bozulan metal malzemeler hem korozyon direnci hem de mekanik özelliklerini kaybetmiş olur. Yüzey özelliklerinin geliştirilmesinde tercih edilen yöntemlerden biri metal kaplama uygulamasıdır. Metal kaplamalar, hem mekanik özellikleri iyileştirmek hem de korozyon nedeniyle malzeme kaybını önlemek amacıyla uygulanmaktadır. Metal kaplama yöntemlerinden olan akımsız kaplama, elektrik akımı olmadan bir indirgeme maddesiyle sulu çözeltiden metalik iyonun katalitik olarak indirgenip metalin yüzeyinde biriktirilmesine dayanan kimyasal indirgeme işlemidir. Akımsız kaplama yöntemiyle; altın, nikel, bakır, gümüş gibi birçok metal kaplanabilmektedir. Endüstride en yaygın tercih edilen kaplama türü sahip olduğu kimyasal, fiziksel ve mekanik özelliklerinden dolayı akımsız nikel kaplamadır. Ayrıca bu yöntem metal kaplama çalışmalarında çoklu alaşım ve kompozit kaplamaların üretilmesini popüler hale getirmektedir. Bu çalışmayla, alüminyum malzeme yüzeyine akımsız nikel kaplama işlemi uygulanmış olup kaplama prosesi için belirlenen çalışma parametrelerinin kaplama kalınlığına, yapışma mukavemetine ve korozyon direncine etkisi incelenmiştir.

Anahtar Kelimeler:

Metal Kaplama, Akımsız Kaplama, Nikel Esaslı, Korozyon Direnci, Kompozit

PRODUCTION OF NICKEL BASED METALLIC COATINGS BY ELECTROLESS COATING METHOD

The surfaces of metal materials working in industrial environments and harsh environmental conditions deteriorate over time depending on the factors in the environment. Metal materials whose surface deteriorates lose both their corrosion resistance and mechanical properties. One of the preferred methods for improving surface properties is metal coating application. Metal coatings are applied both to improve mechanical properties and to prevent material loss due to corrosion. Electroless plating, which is one of the metal plating methods, is a chemical reduction process based on the catalytic reduction of the metallic ion from the aqueous solution with a reducing agent without electric current and its deposition on the surface of the metal. Many metals such as gold, nickel, copper, silver can be coated with electroless plating method. Electroless nickel plating is the most commonly preferred type of plating in the industry due to its chemical, physical and mechanical properties. In addition, this method makes the production of multi-alloy and composite coatings popular in metal coating works. In this study, electroless nickel plating process was applied to the aluminum material surface and the effects of the working parameters determined for the coating process on the coating thickness, adhesion strength and corrosion resistance were investigated.

Keywords:

Metal Coating, Electroless Coating, Nickel-based, Corrosion Resistance, Composite,

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