Chromium (Cr) Addition

Passive Film Formation：Chromium is a crucial alloying element for enhancing corrosion resistance. When chromium is added to AB/AQ43 steel plate, it can form a passive oxide film on the surface. For example, in stainless steels, a chromium content of at least 12% is typically required to ensure good corrosion resistance. In AB/AQ43 steel, even with a lower chromium content than in stainless steels, the chromium atoms react with oxygen in the air or in the corrosive medium to form a thin, adherent chromium - rich oxide layer. This layer acts as a barrier, preventing the underlying steel from coming into direct contact with corrosive substances such as water, acids, or salts.

 

Stability of the Passive Film：The passive film formed by chromium is self - healing to some extent. If the film is damaged mechanically or chemically, chromium in the steel can quickly react with oxygen to repair the damaged area. For instance, in a mildly corrosive environment like a humid atmosphere with low levels of sulfur dioxide, the chromium - containing passive film on AB/AQ43 steel can effectively protect the steel for an extended period. The stability of this film is enhanced with increasing chromium content, up to a certain limit. However, other factors such as the presence of impurities or the temperature of the corrosive medium can also affect the film's performance.

 

 

 

Molybdenum (Mo) Addition

Resistance to Pitting and Crevice Corrosion：Molybdenum is an effective alloying element for improving the resistance of AB/AQ43 steel to pitting and crevice corrosion. In corrosive environments with high chloride concentrations, such as seawater or industrial brines, molybdenum - containing steel forms a more protective film. The molybdenum atoms are incorporated into the passive film, enhancing its stability and resistance to local breakdown. For example, in a chemical plant where the steel is exposed to acidic chloride - containing solutions, the addition of molybdenum can significantly reduce the formation of pits and crevices on the steel surface.

Effect in Acidic Environments：Molybdenum also improves the corrosion resistance of AB/AQ43 steel in acidic environments. It can act as a buffer against acid attack by participating in the formation of protective compounds on the steel surface. In sulfuric acid or hydrochloric acid solutions, the presence of molybdenum can slow down the dissolution rate of the steel, thereby increasing its service life.

 

 

 

 

 

 

 

 

AQ43 Chemical composition:

Grade	C % max	Si % max	Mn % max	P % max	S % max
AB/AQ43	0.21	0.55	1.7	0.035	0.035

 

 

 

Copper (Cu) Addition

Atmospheric Corrosion Resistance：Copper is beneficial for improving the atmospheric corrosion resistance of AB/AQ43 steel. In outdoor applications, such as in construction or infrastructure, copper - containing steel can form a patina - like protective layer. This layer is composed of copper - based corrosion products that are relatively stable and can provide a certain degree of protection against rain, humidity, and pollutants. For example, in a coastal area with a saline - laden atmosphere, the copper in the steel can help to reduce the rate of rusting and degradation.

Biocorrosion Resistance：Copper - containing AB/AQ43 steel also shows better resistance to biocorrosion. In environments where microbial - induced corrosion can occur, such as in water - treatment plants or marine structures, the copper ions released from the steel can inhibit the growth of corrosive microorganisms, thereby reducing the extent of biocorrosion.

 

 

 

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