Chrome is applied to steel through a process called hard chrome plating, also known as industrial or engineered chrome plating.
The Process of Hard Chrome Plating
Hard chrome plating is an electroplating process used to apply a thick layer of chromium to steel parts. The procedure involves several steps:
- Preparation: The steel part is first cleaned thoroughly to remove any dirt, rust, or oil. This ensures proper adhesion of the chromium layer.
- Immersion: The cleaned part is then immersed in a solution of chromic acid.
- Electroplating: An electric current is passed through the solution, causing chromium ions to deposit onto the surface of the steel part. This creates a durable and thick layer of chrome.
Why Use Hard Chrome Plating?
Hard chrome plating provides several benefits:
- Increased Wear Resistance: The hard chrome layer significantly increases the wear resistance of the steel part, extending its lifespan.
- Corrosion Protection: Chrome is highly resistant to corrosion, which helps protect the underlying steel from rust and degradation.
- Improved Surface Properties: The plating process improves the hardness and smoothness of the steel surface.
Practical Applications
Hard chrome plating is widely used in various industries. Examples include:
- Automotive: Coating piston rods, hydraulic cylinders, and other critical components.
- Aerospace: Protecting landing gear, shafts, and other high-stress parts.
- Manufacturing: Improving the wear resistance of machine tools and industrial equipment.
Summary Table
| Step | Description |
|---|---|
| 1. Preparation | Cleaning the steel part to ensure good adhesion. |
| 2. Immersion | Immersing the part in a chromic acid solution. |
| 3. Electroplating | Depositing a chromium layer onto the steel using an electric current. |
