ABDULCABBAR YAVUZ, Kaan KAPLAN, Sitki AKTAS

Paslanmaz Çelik Ağının Farklı Elektrolitler İçerisindeki Elektrokimyasal Davranışları

Bu çalışmanın amacı, tavlanmış paslanmaz çelik ağın korozyon davranışını incelemektir. Çelik ağa 500 ᵒC, 700 ᵒC ve 900 ᵒC'de bir kül fırını içerisinde termal oksidasyon işlemleri uygulanmıştır. Tavlanmış ve tavlanmamış paslanmaz çelik ağların yüzey morfolojisi Elektrokimyasal polarizasyondan önce ve sonra karşılaştırılmıştır. Isıl işlemden sonra çelik yüzeyin pürüzlülüğü artmıştır. Tavlanmamış ve tavlanmış çeliğin korozyon özellikleri doğrusal tarama voltametrisi kullanılarak belirlenmiştir. Tavlı paslanmaz çeliğin korozyon davranışı, ağırlıkça % 3.5'lik NaCl, 1 M H2SO4 ve 1 M KOH elektrolitlerinde bir potansiyostat ile incelenmiştir. Isıl işlem görmüş paslanmaz çeliğin korozyon duyarlılığı, alkalin elektrolitte ısıl işlem görmemiş paslanmaz çeliğinkinden daha fazlaydı. Tavlanmamış ve tavlanmış paslanmaz çeliğin çukur korozyonu farklıyken, ısıl işlem uygulanmayan çelik ağın korozyon akımı ve korozyon potansiyeli 500 ᵒC ve 700 ᵒC'de tavlanan çelik ağlarla aynıydı. Tavlanmamış çeliğin korozyon akımı ve korozyon potansiyeli asidik ortamda 500 ᵒC tavlanmış çelik ağınkiyle aynıydı.

Anahtar Kelimeler:

Korozyon, Paslanmaz Çelik, Isıl İşlem, Isıl Oksidasyon

CORROSION BEHAVIOR OF ANNEALED STAINLESS STEEL MESH IN DIFFERENT ELECTROLYTES

The aim of this study was to investigate the corrosion behaviour of annealed stainless steel mesh. Thermal oxidation treatments were applied to steel mesh in a muffle furnace at 500 ᵒC, 700 ᵒC and 900 ᵒC. Surface morphology of annealed and non-annealed stainless steel meshes was compared before and after polarization. Roughness of the steel surface was increased after heat-treatment. The corrosion properties of non-annealed and annealed steel were determined using linear sweep voltammetry. The corrosion behaviour of annealed stainless steel was examined by means of a potentiostat in a 3.5 wt.% NaCl, 1 M H2SO4 and 1 M KOH electrolytes. The corrosion susceptibility of heat treated stainless steel was more than that of non-heat treated stainless steel in alkaline electrolyte. While pitting corrosion of non-annealed and annealed stainless steel was different, corrosion potential and current of steel mesh without heat treatment was the same as the steel meshes annealed at 500 ᵒC and 700 ᵒC. Corrosion current and corrosion potential of non-annealed steel was the same as 500 ᵒC annealed steel mesh in acidic medium.

Keywords:

Corrosion, Stainless Steel, Heat-treatment, Thermal Oxidation,

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