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Time: 2014/6/11 15:05:56 Author: Admin Hits:
The rust is to prevent the metal oxide in oxygen and water under the condition of coexistence, simply refers
to the corrosion of oxygen and water to metal, and metal corrosion types actually many, according to
the different characteristics of the corrosion process, corrosion, electrochemical corrosion can be divided
into two categories. As follows:
1, chemical corrosion is the metal surface in the action of variouschemical mediators are, called chemical
corrosion. Chemical corrosion andcorrosion in the gas for corrosion and the conductive solution. Gas
corrosion is adry gas with the metal contact, to generate the metal surface compounds, such as oxides,
chlorides, sulfides etc.. And as the steel during rolling, welding, heat treatment process, because of the high
temperature oxidation and oxide coating.
2, the electrochemical corrosion is in contact with the surrounding electrolyte solution of metal, corrosion
caused by the current action. Many surface forms of electrochemical corrosion, and can be divided into:
corrosion air corrosion,conductive medium and other conditions. Air corrosion, the corrosion of the metal isin
the humid air. The conductive medium corrosion, metal under the rain pouring,or water solution in various
acid, alkali, salt in the corrosion. Corrosion under the other conditions, is refers to the metal pipe, the laying of
underground structures,the long-term erosion of corrosive medium in moist soil and by corrosion damage.
The new concept of rust is to isolate objects (including oxygen, water, acid, alkali,salt and other) effects on
metal, maintain the physical form of the original metal, in order to achieve the desired saving metal. Anti rust oil
classification according to SH/T0692-2000 standard: Lubricating antirust oil, antirust oil solvent dilution
(thinfilm (Ban Gan) type storage antirust oil, antirust grease), water displacement type antirust oil, gas phase
anti rust oil, in addition to the fingerprint type rust preventive oil.
Two、anti rust process difficulties:
1, antirust difference: not up to the expected time of rust.
2, wettability is poor: for spraying, coating, soaking in use, not better coating on the surface of workpiece.
3, the poor performance of the workpiece to be: degreasing cleaning, oil is not easy to remove.
4, replacement of water poor: workpiece with water, the water is not the replacement parts dry.