Introduction to hard chrome

- Aug 14, 2018 -

Hard chrome, also known as industrial chrome or engineered chrome, is used to reduce friction, improve durability through wear and wear resistance, minimize wear or seizure of parts, and expand chemical inertness to include a wider range of conditions ( In particular, oxidation resistance, arguably the most famous quality, and the expansion material used to wear parts to restore its original size. Very hard, measuring 65 to 69 HRC (also based on the hardness of the base metal). Hard chrome tends to be thicker than decorative chrome, with a standard thickness range of 0.02 to 0.04 mm (20 to 40 microns) for non-standard thicknesses. But for extreme wear resistance requirements, it can be an order of magnitude thicker, in which case 1 mm (100 microns) or more can provide the best results. Unfortunately, such thicknesses emphasize the limitations of the method by overcoming this limitation by plating additional thickness, then grinding and grinding to meet the requirements or to improve the overall aesthetics of the "chrome plated" piece. Increasing the thickness of the coating will magnify the surface defects and roughness proportionally because the hard chrome has no flattening effect. Pieces that are not ideally shaped in terms of electric field geometry (almost all components used for electroplating except for spheres and egg-shaped objects) require thicker plating to compensate for uneven deposition and are mostly wasted when grinding parts Go back to the size you want.

Modern "engineering coatings" do not suffer from such shortcomings, which often result in a reduction in hard chrome prices due to labor costs. Hard chrome replacement technology is superior to hard chrome in terms of wear resistance, corrosion resistance and cost. Rockwell hardness 80 is not specific to this material. The uniform thickness of spray coatings, which typically does not require further polishing or machining, is a standard feature of modern engineered coatings. These coatings are typically polymers of proprietary embodiments protected by patents or trade secrets, composites of metal and ceramic powders or fibers, and are therefore generally known under the trade names.

Depending on the application, hard chrome plating can be affected by different types of quality requirements; for example, the corrosion resistance of the coating on the hydraulic piston rod is tested by a salt spray test.

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