What properties are included in chemical properties?

What properties are included in chemical properties?

What properties are included in chemical properties?

Name

Quantitative symbol

Unit symbol

Meaning

1.

Resistant

Rot

eclipse

Sex

Corrosion resistance refers to the ability of metal materials to resist the corrosive effects of surrounding media (atmosphere, water vapor, harmful gases, acids, alkalis, salts, etc.). The corrosion resistance of metals is related to many factors, such as the chemical composition of metals, processing properties, heat treatment conditions, tissue state, and media and temperature.

(1) Chemical corrosion

Chemical corrosion is the result of direct chemical interaction between the metal and the surrounding medium. It includes both gas corrosion and corrosion of metals in non-electrolytes. It is characterized in that the corrosion process does not generate current; and the corrosion products are deposited on the metal surface.

(2) Electrochemical corrosion

Corrosion caused by the action of a metal in contact with an electrolyte solution such as an acid, a base or a salt is called electrochemical corrosion. It is characterized by the generation of electric current during the corrosion process, and the corrosion product (rust) is not covered on the metal surface as the anode, but at a certain distance from the anode metal.

(3) General corrosion

This kind of corrosion is evenly distributed on the inner and outer surfaces of the whole metal, so that the cross section is continuously reduced, and finally the force member is destroyed.

(4) Intergranular corrosion

This corrosion occurs inside the metal along the edge of the grain. Usually does not cause any change in the shape of the metal, often causing sudden destruction of equipment or parts

(5) pitting corrosion

This corrosion is concentrated in areas where the metal surface is not large. And quickly develop to the depths, and finally penetrate the metal, is a more harmful corrosion damage

(6) Stress corrosion

It refers to the damage caused by metal in corrosive media under the action of static stress (internal and external stress of metal). This type of corrosion generally passes through the grains, the so-called transgranular corrosion

(7) Corrosion fatigue

Refers to the damage caused by metal in corrosive media under the action of alternating stress. It is also a transgranular corrosion

(8) Corrosion rate

Mg/(dm2Â·d) or g/(m2Â·d)

The weight loss of a metal material per unit area after being corroded per unit time is called the corrosion rate.

(9) Corrosion rate

R

Mm/a

The depth of the material that the metal material corrodes in a unit of time is called the corrosion rate.

2. Oxidation resistance

g/(cm2.h) or mm/a

The ability of metallic materials to resist oxidation at room or elevated temperatures. The oxidation process of metals is actually a form of chemical corrosion. It can be directly used for a certain period of time, the weight loss of the metal surface after corrosion, that is, the speed of metal weight loss

3. Chemical stability

Refers to the general term for corrosion resistance and oxidation resistance of metallic materials. The chemical stability of metallic materials at high temperatures is called thermal stability.

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Name	Quantitative symbol	Unit symbol	Meaning
1. Resistant Rot eclipse Sex		Corrosion resistance refers to the ability of metal materials to resist the corrosive effects of surrounding media (atmosphere, water vapor, harmful gases, acids, alkalis, salts, etc.). The corrosion resistance of metals is related to many factors, such as the chemical composition of metals, processing properties, heat treatment conditions, tissue state, and media and temperature.
(1) Chemical corrosion	Chemical corrosion is the result of direct chemical interaction between the metal and the surrounding medium. It includes both gas corrosion and corrosion of metals in non-electrolytes. It is characterized in that the corrosion process does not generate current; and the corrosion products are deposited on the metal surface.
(2) Electrochemical corrosion			Corrosion caused by the action of a metal in contact with an electrolyte solution such as an acid, a base or a salt is called electrochemical corrosion. It is characterized by the generation of electric current during the corrosion process, and the corrosion product (rust) is not covered on the metal surface as the anode, but at a certain distance from the anode metal.
(3) General corrosion			This kind of corrosion is evenly distributed on the inner and outer surfaces of the whole metal, so that the cross section is continuously reduced, and finally the force member is destroyed.
(4) Intergranular corrosion			This corrosion occurs inside the metal along the edge of the grain. Usually does not cause any change in the shape of the metal, often causing sudden destruction of equipment or parts
(5) pitting corrosion			This corrosion is concentrated in areas where the metal surface is not large. And quickly develop to the depths, and finally penetrate the metal, is a more harmful corrosion damage
(6) Stress corrosion			It refers to the damage caused by metal in corrosive media under the action of static stress (internal and external stress of metal). This type of corrosion generally passes through the grains, the so-called transgranular corrosion
(7) Corrosion fatigue			Refers to the damage caused by metal in corrosive media under the action of alternating stress. It is also a transgranular corrosion
(8) Corrosion rate		Mg/(dm2Â·d) or g/(m2Â·d)	The weight loss of a metal material per unit area after being corroded per unit time is called the corrosion rate.
(9) Corrosion rate	R	Mm/a	The depth of the material that the metal material corrodes in a unit of time is called the corrosion rate.
2. Oxidation resistance		g/(cm2.h) or mm/a	The ability of metallic materials to resist oxidation at room or elevated temperatures. The oxidation process of metals is actually a form of chemical corrosion. It can be directly used for a certain period of time, the weight loss of the metal surface after corrosion, that is, the speed of metal weight loss
3. Chemical stability			Refers to the general term for corrosion resistance and oxidation resistance of metallic materials. The chemical stability of metallic materials at high temperatures is called thermal stability.