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STAINLESS STEELModify Date : 2018-11-19 13:59:14
▣ STAINLESS Lecture Definition
A special steel containing more than 12% Cr, which forms a dense film of surface Cr oxide and prevents rust.
There are 13Cr steel, 18Cr steel, and 18Cr-8Nj steel, and Cr is composed of Cr₂0₃ layer (20 ~ 30), which is a very thin chromium oxide film on the steel surface, to block oxygen invading into metal base. By playing a role, it has a rust-free property.
#The structure of the floating film
#Passivity
Dynamics is a very thin oxide film formed on the metal surface, which means that metals and alloys lose chemical reactivity and become fluorinated, increasing corrosion resistance.
Passive film formation by chrome-based oxide film
The passivation of stainless steel is formed by the chromium oxide film formed by the combination of chromium, the main alloying element, with oxygen.
To form a more dense and corrosion-resistant passivation film naturally formed in the air but chemically oxidized, it is precipitated in 15% nitric acid solution maintained at 60 ° C for 20-30 minutes and washed with water.
In order to form the passivation film more easily and have excellent corrosion resistance, the amount of chromium in the alloying elements should be increased and alloy elements having high corrosion resistance such as nickel or molybdenum should be added.
#STAINLESSClassification
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