The Different Methods of Metal Refinishing

The Different Methods of Metal Refinishing

Metal is a natural element found in abundance in many homes and at work. It is very hard and crude when it comes out of the earth but needs to be finished, polished, and processed to be used in the most effective way possible.

The finishing process minimizes wear on metal products and increases their durability, electrical conductivity, chemical resistance, and vulcanization. It also adds to their aesthetic look.



Grinding is a method of metal refinishing NYC that involves removing rust, dirt, grime, and other flaws from the surface of a metal part. The process can also help smooth a rough or uneven surface, giving the piece a nice finish.

Grinding involves a rotating tool, usually a wheel, that contains abrasive grains. These grains act like miniature cutting tools, removing tiny chips of material from the workpiece’s surface.

The amount of material removed per wheel revolution can vary depending on the abrasive grain’s grit size and the type of material. When abrasive grains become dull, the amount of material removed is reduced.

In grinding, three interactions occur between the abrasive and machined materials: cutting, plowing, and sliding. These processes affect the surface finish and dimensional accuracy of the machined part.


Brushing is a metal finishing technique that combines grinding and buffing. It reduces blemishes and creates a smooth surface for various metal parts, including aluminum and stainless steel.

Unlike plating, which adds a layer of nickel, chrome, or zinc to the metal, brushing improves the look of a product without changing its characteristics. It can also reduce rust and make the metal easier to clean and maintain.

Brushing primarily uses wire brushes or abrasive belts to remove imperfections, slags, and grit from the surfaces of machined products. It can produce a textured grain that looks like a mirror finish on metals.


Blasting is a method of metal refinishing that uses abrasive media to remove rust, scale, and paint. It also helps to smooth the surface of a product and give it a finished look.

Sandblasting is the most common form of abrasive treatment. It takes compressed air as a power source and directs a stream of abrasive media toward a surface to clean or prepare it for a coating.

It can be a highly effective process, but it can warp or deform the part if not done properly. For this reason, it is essential to use proper procedures and equipment for sandblasting.

Shot blasting, on the other hand, is a centrifugal abrasion treatment that propels spherical shot-like material against a surface. It is usually a less aggressive abrasive technique than sandblasting, but it can be more effective on harder surfaces that require stronger preparation.

Both sandblasting and shot blasting are effective cleaning and preparation methods, but they employ different types of equipment. Typically, sandblasting is more cost-effective than shot blasting because it does not produce as much dust.

Hot Blackening

Blackening is a method of metal refinishing that produces a black or dark brown finish on iron and steel parts. It can be used for cosmetics or corrosion protection.

A blackened finish can be achieved using hot chemical or oil methods. It also can be achieved by applying a coating.

Depending on the final finish, the sealant used will determine the gloss and level of corrosion resistance. Many different types of sealants are available, including solvent-based and water-displacing formulations.

The blackening process is usually a timed operation requiring 10-30 min dwell times. Cold black oxide works best on low-carbon steels. Still, medium and high-carbon materials may require additional time in the activation tank or a stronger mix of blackening chemicals to bond with the material.

A clean cold water rinse is necessary to remove residues from the blackening solution. This rinse is often treated with ion exchange to reduce the concentration of pollutants and improve part quality.