A steel left outside in air corrodes because: it has too much Cr which increases
ID: 1010491 • Letter: A
Question
A steel left outside in air corrodes because: it has too much Cr which increases the Pilling Bedworth ratio above 2 it has too much syndiotactic martensite spalling produces ferritic oxide which looks brown because of the Cr and Mn contents Diffusion of C in austenite is too small to yield a galvanic cell Ferrite becomes the anode and cementite becomes the cathode Cementite becomes the anode and ferrite becomes the cathode Cold working generally increases the corrosion rate in metallic alloys. True False Most plastics cannot be recycled and reused easily because: Most plastics are thermosets most plastics contain pearrlite most plastics contain a relatively large fraction of many different additives most plastics contain secondary bonds in the main cahin and covalent bonds between molecules most plastic have a pilling bedworth ratioExplanation / Answer
A steel left outside in air corrodes because any material made with iron that is exposed to both oxygen and water will rust. Because steel is made almost entirely of iron, it is the most highly manufactured man made material that is subject to rust.Water vapour(in atmosphere) is made of an oxygen atom with 6 outer electrons and 2 hydrogen atoms that have 1 electron each. Through the borrowing and sharing of electrons in a reduction reaction, FeO(OH) (the most common form of rust) is created.
Coating steel with a thin layer of chromium oxide is more commonly referred to as stainless steel, and is one of the most widely manufactured corrosion resistant steels in the world. The chromium acts mostly to prevent the oxidation process of corrosion from occurring, as it acts as a barrier of oxygen from reaching the iron of the steel.
So option (3) is correct
Remaing to answers as you done are correct
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