The low coefficient of friction of the chromium plated layer (especially the lowest dry coefficient of friction among all metals) and the wide range of adjustable hardness (400-1200HV) can significantly improve the wear resistance of the parts.
Author: Anna
Advantages
1.Excellent wear resistance
The low coefficient of friction of the chromium plated layer (especially the lowest dry coefficient of friction among all metals) and the wide range of adjustable hardness (400-1200HV) can significantly improve the wear resistance of the parts.
The surface hardness can reach HR65 or above, and there is no significant change in hardness and luster at high temperatures (below 500°C).
2.Good chemical stability
Stable in alkali, sulfide, nitric acid and most organic acids, only dissolved in hydrochloric acid and hot sulfuric acid.
Long-term exposure to humid air or alkaline environment can still maintain corrosion resistance.
3.High heat resistance
No significant oxidative discoloration occurs below 500°C, and the hardness only begins to decrease above 700°C.
4.Aesthetics and functionality at the same time
High surface finish, reflectivity up to 65%, and not easy to change color in long-term use, suitable for decorative applications (such as automotive accessories, home furnishings).
The thickness of plating can be adjusted to compensate for the deviation of parts size.
Disadvantages
1.Process cost and processing limitations
Higher price, difficult to process after plating, not suitable for complex structure parts.
Thin plating layer (usually only micron level), demanding surface roughness of the substrate.
2.Potential corrosion risk
If there are holes, cracks or scratches in the plating layer, the base metal is prone to rust when exposed, and the quality of the process needs to be strictly controlled.
Corrosion resistance may be reduced in strong acids, high temperatures or long-term humid environments.
3.Mechanical property defects
The chromium plating layer is brittle and easy to fall off when impacted or bent.
Porous structure may affect the long-term stability, need to cooperate with passivation and other post-treatment.
4.Environmental and health hazards
The chromium plating process involves toxic substances such as hexavalent chromium, which requires strict control of wastewater and gas emissions.
Chromium plating is suitable for parts that require high wear resistance, heat resistance and decorative appearance (e.g. mechanical shafts, lamps, sanitary hardware), but in strong corrosive environments or complex working conditions, it needs to be chosen carefully and pay attention to the quality control of the process.