subject: Protective Coatings [print this page] Just as we cover our bodies and skin with protective coatings like weather-resistant clothing and SPF lotions, we also must apply the same type of protective coatings to machinery. This is especially crucial for machinery that has been manufactured using inferior metals that are prone to premature degradation. Types of premature degradation can include erosion, chemical corrosion, cavitation (harmful pitting of the base metal), friction, weather, and fretting.
Coatings are coverings that are applied to any surface; metal surfaces are common applications. The purpose of the coating is to improve the current properties of the surface. Typical surface improvements include appearance, adhesion, wetability, corrosion resistance, wear resistance and scratch resistance. Depending on the desired application, coatings may be applied as liquids, gases or solids. The application process is also dependent on the material being applied and the material that it's being applied to. Coatings can be done in desired thicknesses, and consequently measured, to ensure the desired thickness of the coating was achieved.
Protective coatings can be applied in a variety of ways to ensure proper adhesion. Potential coating processes include; dip-coating, roll-to-roll, chemical vapor deposition, physical vapor deposition, spraying, optical, and chemical and electrochemical. When choosing a company to add protective coatings to new or existing machinery, it's important to be cognizant of industry standards and the standards practiced by the company that is being solicited. Coating applications can be costly, so it's important to choose correctly in the beginning.
Protective coatings help guard against corrosion which can occur over time due to a multitude of factors. The coatings decrease the likelihood corrosion or wear will occur on the machinery. Hence, coatings can be used as a corrosion resistant coating or a wear resistant coating; which is dependent on the applications and needs of the machine or product. When enlisting a company to provide coatings, it's imperative to ask about resistance tests that have been performed on the coating. This line of questioning will ensure that the coatings are able to withstand the intended use. If it doesn't meet the desired requirements, selecting a new coating may be necessary. When contacting a company to request coatings services, they will generally suggest the coatings that will be best suited for the desired application, industry, environment and a bevy of other factors.
Protective coatings not only ensure continued protection of the product, they can also reduce friction. The reduction in friction varies based on the type of coating being applied.
