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Will chrome rust?

Release time:

2023-12-21

Source:

The chromium coating does have an anti-rust effect to a certain extent, but its anti-rust performance is relatively slow. In contrast, the anti-rust performance of galvanized (especially the galvanized layer after passivation treatment) is more superior, so it has been widely used in many engineering projects, such as outdoor transmission towers, highway guardrails, auto parts and metal parts such as daily hardware.

Hard chrome plating is a traditional surface plating technology with a history of more than 70 years. Its significant advantages include high hardness, excellent wear and corrosion resistance, and the ability to maintain a bright surface for a long time. In addition, the hard chrome plating process is relatively simple and the cost is low, so in addition to being used as a decorative coating, it is also widely used as a wear-resistant and corrosion-resistant coating for mechanical parts. In the repair of damaged parts, hard chrome plating technology is also often used.

However, the process of electroplating hard chromium also has some disadvantages. First of all, the chromic acid solution used in this process will produce chromic acid mist and waste water, which will cause serious environmental problems. Secondly, although the hardness of the hard chromium plating layer is generally 800 ~ 900HV, it is still low compared to some ceramics and cermet materials, and its hardness will decrease with the increase of temperature. In addition, there may be microcracks in the chromium plating layer, which may cause the corrosion medium to penetrate from the surface to the interface, and then corrode the substrate, causing rust spots or even peeling on the surface of the plating layer.

Key words:

Chrome plating knowledge (I)

What is the role of chrome plating?

Chrome plating knowledge (I)

What is the role of chrome plating?