Anodizing of SS304 creates a thick oxide layer on that. Is this layer non-electrical conductive? What thickness should be obtained in order to make the surface non-electrical conductive?
Dear Dr. Farid Movassagh-Alanagh ,
stainless steels are a “poor” conductor compared to most metals, about 40 times worse than copper.
The reason is that conductivity in metals is high is that metals form a crystal lattice where the outer shell electrons are shared and easily move through the lattice. When the lattice has imperfections the flow of electrons is retarded. Stainless steel is an alloy of iron with up to about 25% chromium (and other elements added for corrosion resistance). The surface chromium atoms disrupt the regular iron lattice and increase the chances of inelastic collisions with moving electrons.
Anodization process creates a thick oxide layer on the SS 304 surface but however, I don't think this can lead to a totally non-conductive surface, it will only have significantly lower conductivity ...
I suggest you to have a look at the following, interesting paper:
-Corrosion Resistance of Anodic Layers Grown on 304l Stainless Steel at Different Anodizing Times and Stirring Speeds
Laura Patricia Domínguez Jaimes , Anabel Álvarez Méndez, Astrid Sánchez Vázquez, Juan Jacobo Ruiz Valdés, Erika Iveth Cedillo González, Ana Conde del Campo, Juan José De Damborenea González, María Ángeles Arenas Vara, and Juan Manuel Hernández López
Conference: 1st Coatings and Interfaces Web Conference (2019)
Available, on RG as full text, at: https://www.researchgate.net/publication/331782067_Corrosion_resistance_of_anodic_layers_grown_on_304L_stainless_steel_at_different_anodizing_times_and_stirring_speeds
My best regards, Pierluigi Traverso.
What type of oxide were you mentioned here? As an example, alumina could be formed. Similarly to a ceramic, it increases the resistance to the electrical conductivity but eventually will let the ions go through as it has a porous nature.
Dear Dr. Farid Movassagh-Alanagh ,
stainless steels are a “poor” conductor compared to most metals, about 40 times worse than copper.
The reason is that conductivity in metals is high is that metals form a crystal lattice where the outer shell electrons are shared and easily move through the lattice. When the lattice has imperfections the flow of electrons is retarded. Stainless steel is an alloy of iron with up to about 25% chromium (and other elements added for corrosion resistance). The surface chromium atoms disrupt the regular iron lattice and increase the chances of inelastic collisions with moving electrons.
Anodization process creates a thick oxide layer on the SS 304 surface but however, I don't think this can lead to a totally non-conductive surface, it will only have significantly lower conductivity ...
I suggest you to have a look at the following, interesting paper:
-Corrosion Resistance of Anodic Layers Grown on 304l Stainless Steel at Different Anodizing Times and Stirring Speeds
Laura Patricia Domínguez Jaimes , Anabel Álvarez Méndez, Astrid Sánchez Vázquez, Juan Jacobo Ruiz Valdés, Erika Iveth Cedillo González, Ana Conde del Campo, Juan José De Damborenea González, María Ángeles Arenas Vara, and Juan Manuel Hernández López
Conference: 1st Coatings and Interfaces Web Conference (2019)
Available, on RG as full text, at: https://www.researchgate.net/publication/331782067_Corrosion_resistance_of_anodic_layers_grown_on_304L_stainless_steel_at_different_anodizing_times_and_stirring_speeds
My best regards, Pierluigi Traverso.
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