What is the difference between the performance characteristics of brass bushings and bronze bushings?

The main differences between the performance characteristics of brass bushings and bronze bushings are as follows:

Mechanical properties:

Brass bushings:

good plasticity and strength, moderate hardness. Tensile strength is generally between 300 - 600MPa, elongation is good, can reach 30% - 50%. But its wear resistance relative to the bronze sleeve is slightly worse.

Bronze bushings:

Tin bronze: with high strength and hardness, tensile strength up to 400 - 700MPa, hardness between 100 - 200HB. Wear resistance is better, in the friction conditions can form a stable oxide film, reduce wear.

Aluminum bronze: higher strength and hardness, tensile strength can be more than 700MPa, hardness can be up to 200 - 300HB. has excellent corrosion resistance and wear resistance, especially suitable for working in harsh environments.

Beryllium Bronze: Very high strength and hardness, tensile strength can be up to 1200 - 1400MPa, hardness can be up to 350 - 400HB. also has good elasticity and electrical conductivity.

Corrosion resistance:

Brass bushings: 

in the atmosphere, fresh water and other environments have a certain degree of corrosion resistance, but in environments containing corrosive media, such as seawater, acids, alkalis, etc., corrosion is prone to occur. Especially when the zinc content in brass is high, dezincification corrosion is likely to occur.

Bronze bushings:

Tin bronze: has good corrosion resistance in atmosphere, fresh water and seawater, and has some resistance to some organic acids and alkaline solutions.

Aluminum bronze: excellent corrosion resistance, excellent performance in seawater, chlorides, sulfides and other corrosive environments.

Beryllium Bronze: Good corrosion resistance, stable in most environments.

Friction performance:

Brass bushings: 

the coefficient of friction is relatively high, generally between 0.15 - 0.3. In the lubrication condition, its friction performance is OK, but in the dry friction or boundary lubrication condition, it is easy to wear and adhesion phenomenon.

Bronze bushings:

low coefficient of friction, generally between 0.05 - 0.15. In particular, bronze bushings containing solid lubricants such as graphite have good self-lubricating properties and can work under oil-free or oil-poor conditions, reducing wear and friction losses.