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Needle valve corrosion, is generally understood to needle valve metal material in the chemical or electrochemical environment under the action of the damage suffered. As the "corrosion" phenomenon seen in the metal spontaneous interaction with the surrounding environment were, and how the metal with the surrounding environment isolated or more of the use of non-metallic composite materials is the focus of anti-corrosion.

needle valve body (including the valve cover), occupying most of the weight of the valve, but also in regular contact with the media, so use the valve, often starting from the valve body material.

valve no more than two forms of corrosion, or chemical corrosion and electrochemical corrosion. It is the corrosion rate determined by the medium temperature, pressure, chemical properties as well as the body material corrosion resistance.

corrosion rate can be divided into six, etc.:
1, completely corrosion: the corrosion rate of less than 0.001 mm / year;
2, extremely corrosion: the corrosion rate from 0.001 to 0.01 mm / year;
3, corrosion: corrosion rate from 0.01 to 0.1 mm / year;
4, yet corrosion: the corrosion rate from 0.1 to 1.0 mm / year;
5, poor corrosion resistance: the corrosion rate from 1.0 to 10 mm / year;
6, no corrosion: the corrosion rate of greater than 10 mm / year.