Forms and Causes of Corrosion of Parts of Strech Film Rewinder
The electrochemical corrosion of the parts of the stretch film rewinder is the corrosion of metals under the action of electrolytes (acid, alkali, salt aqueous solution and water containing air). Corrosion of external parts of agricultural machinery and tractors exposed to humid air, as well as corrosion of parts in contact with acidic combustion gases, such as valves, piston tops, combustion chambers, are common examples of electrochemical corrosion.
The corrosion forms of the parts of the stretch film rewinder can be divided into: corrosion of the whole surface (known as surface rust); Local corrosion (pitting, rust spot); Corrosion under the surface layer (such as aluminum corrosion); The corrosion of metal grains destroys the connection between grains and completely loses the mechanical properties of the metal (such as the results of long-term use of cylinder head, piston top, exhaust manifold, etc.). In this case, the metal becomes soft and can no longer be used.
The lower the surface finish of the stretch film rewinder parts, the more metal corrosion can be promoted. At the bottom of the part depression and the surface crack, there are often the most active places for gas and corrosive substances. The deeper the surface cracks and depressions, the stronger the corrosion. With the increase of time, the corrosion will go deep into the interior along the concave sharp corner, making the surface of the parts more damaged.
The following methods can be used to prevent the corrosion of the parts of the stretch film rewinder: improve the surface finish of the parts; Apply oil on the surface of parts; The non working surface shall be coated with anti-corrosion paint, chrome plating, zinc plating, etc.
