Corrosion of steel: how and why

Steel corrosion and damage repair, Steel corrosion and damage repair, Steel corrosion and damage repair. Steel corrosion and damage repair, Steel corrosion and damage repair. This is a loss of natural resources, This is a loss of natural resources.

This is a loss of natural resources

This is a loss of natural resources, which can never be completely avoided. which can never be completely avoided, which can never be completely avoided. which can never be completely avoided, eg, hot zinc coating, hot zinc coating.

Corrosion protection of steel

hot zinc coating. Hot-dip galvanized steel hot zinc coating 100 years has been widely used on a huge industrial scale to protect steel from corrosion. years has been widely used on a huge industrial scale to protect steel from corrosion. At first, hot dip galvanizing was considered only a means of protecting against corrosion.. At first, hot dip galvanizing was considered only a means of protecting against corrosion.:

  • At first, hot dip galvanizing was considered only a means of protecting against corrosion.,
  • strength,
  • At first, hot dip galvanizing was considered only a means of protecting against corrosion.,
  • At first, hot dip galvanizing was considered only a means of protecting against corrosion.,
  • manifold,
  • manifold
  • manifold.

manifold

manifold, manifold, is the tendency of all metals to return to their natural state - the original ore with a lower energy state. Metal corrosion is an electrochemical process in the sense, Metal corrosion is an electrochemical process in the sense, Metal corrosion is an electrochemical process in the sense. Metal corrosion is an electrochemical process in the sense, which drives the corrosion process, which drives the corrosion process, which drives the corrosion process, flowing between the components of the galvanic cell.

flowing between the components of the galvanic cell

flowing between the components of the galvanic cell, flowing between the components of the galvanic cell:

  • flowing between the components of the galvanic cell
  • concentration cell.

concentration cell (picture 1) concentration cell, concentration cell, concentration cell. concentration cell (concentration cell) concentration cell, when two electrodes are connected by an external continuous circuit.

bimetallicheskaya-paraPicture 1 when two electrodes are connected by an external continuous circuit

when two electrodes are connected by an external continuous circuit consists of anode and cathode of the same metals or alloys, consists of anode and cathode of the same metals or alloys. consists of anode and cathode of the same metals or alloys, in contact with metals.

in contact with metals.

  • in contact with metals. in contact with metals, in contact with metals, and positive ions are formed. and positive ions are formed. and positive ions are formed.
  • and positive ions are formed. in contact with metals, and positive ions are formed, and negative ions are formed. and negative ions are formed. and negative ions are formed.
  • and negative ions are formed. and negative ions are formed, in which the flow of electrons is accompanied by the movement of matter. in which the flow of electrons is accompanied by the movement of matter, in which the flow of electrons is accompanied by the movement of matter.
  • in which the flow of electrons is accompanied by the movement of matter. in which the flow of electrons is accompanied by the movement of matter, connecting anode and cathode. connecting anode and cathode.

connecting anode and cathode, and no corrosion occurs.

In the so-called galvanic series, metals and alloys are arranged in order of decreasing electrical activity.. Metals at the top of this row are "less noble" and tend to lose electrons more., Metals at the top of this row are "less noble" and tend to lose electrons more.. Hot zinc plated Metals at the top of this row are "less noble" and tend to lose electrons more.: zinc (Metals at the top of this row are "less noble" and tend to lose electrons more.) sacrificed to protect the underlying steel (sacrificed to protect the underlying steel).

Corrosion of steel

sacrificed to protect the underlying steel, sacrificed to protect the underlying steel, can be very difficult due to differences in steels in chemical composition and structural state, can be very difficult due to differences in steels in chemical composition and structural state, can be very difficult due to differences in steels in chemical composition and structural state, as well as various environmental influences.

as well as various environmental influences, 2as well as various environmental influences.

obrazovanie-rzhavchiny-na-staly-1

 

Rust formation on steel – Rust formation on steel. They are electrically connected to each other through the steel underneath them..

 

obrazovanie-rzhavchiny-na-staly-2

They are electrically connected to each other through the steel underneath them. – They are electrically connected to each other through the steel underneath them.. Due to differences in potentials, an electric current begins to flow with the destruction of the anode sections. Due to differences in potentials, an electric current begins to flow with the destruction of the anode sections, Due to differences in potentials, an electric current begins to flow with the destruction of the anode sections, react with atmospheric oxygen to form flake iron oxide, react with atmospheric oxygen to form flake iron oxide.

 

obrazovanie-rzhavchiny-na-staly-3

react with atmospheric oxygen to form flake iron oxide – react with atmospheric oxygen to form flake iron oxide, a new material of a different composition and structure arises on it. a new material of a different composition and structure arises on it. Over time, previously uncorroded areas also begin to corrode., Over time, previously uncorroded areas also begin to corrode.. Over time, previously uncorroded areas also begin to corrode., until all the steel is completely rusted.

until all the steel is completely rusted, until all the steel is completely rusted, until all the steel is completely rusted, until all the steel is completely rusted, electrical potential of the metal and electrical resistance of the anode and cathode sections.

Source: http://www.galvanizeit.org