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    Home > Coatings News > Paints and Coatings Market > Chemical nickel plated surface treatment before related matters

    Chemical nickel plated surface treatment before related matters

    • Last Update: 2020-12-26
    • Source: Internet
    • Author: User
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    In order to strengthen the performance of metal surface use, in industrial use, we will generally use chemical nickel plating for surface treatment to improve, chemical nickel plating treatment corrosion resistance is relatively good, and its color is also good, so it will be effective in this heat treatment, in the process of treatment of its deformation is small, so with the continuous development and improvement of the chemical nickel plated industry, so it will be in the field of steel glow development and use.But in order to get better results in the use of metal surfaces, before chemical nickel plating needs to be treated: 1, de-oiling: oil removal method can be divided into organic solvent de-oiling, chemical de-oiling. Organic solvent oil removal is characterized by fast oil removal speed, do not corrode metals, but oil removal is not complete, the need to use chemical or electrochemical methods to supplement oil removal, commonly used organic solvents are: gasoline, kerosene, benzene, ketones, certain chlorinated alkanes and olefins. Organic solvent de-oiling also has the advantage that the oil-removed solvent can also be recycled. Organic solvents are generally flammable and should be used with extreme care.chemical de-oiling is the use of alkali solution saponification and surfactants on the emulsification of non-saponified oils, removing various oils on the surface of the work piece. The temperature of chemical de-oiling is usually taken between 60-80 degrees, the effect of the work piece is generally visual, that is, the surface of the work piece can be completely moisturized is a sign that the oil is completely removed. The general de-oiling fluid consists of sodium hydroxide, sodium carbonate, trisodium phosphate, water glass, emulsifying agent, etc. Electrochemical de-oiling diode de-oiling and anode de-oiling, in the same current, cathode de-oiling produces twice as much hydrogen as anode oil removal produces oxygen, bubbles are small and dense, emulsification capacity is large, oil removal effect is better. However, it is easy to cause the phenomenon of hydrogen brittleness and impurities in the cathode. Anode de-oiling does not have these disadvantages but may cause oxidation and dissolution of the work surface of the work piece. At present, the chemical de-oiling method of positive and negative pole exchange is commonly used. The electrochemical de-oil formulation is similar to the chemical de-oiling formula.2, rust removal: rust removal methods have mechanical, chemical and electrochemical methods. Mechanical rust removal is the mechanical treatment of blasting, grinding, rolling or polishing the surface of the work piece, removing the surface rust layer while the surface of the work piece is leveled. Chemical rust removal is the use of acid or alkali solution for strong erosion treatment of metal products so that the surface of the rust layer through chemical action and erosion process produced by the mechanical peeling of hydrogen bubbles and remove. Electrochemical rust removal is the removal of rust layers from the cathode or anode treatment of metal products in acid or alkali solutions. Anode rust removal is the mechanical stripping of oxygen bubbles produced by chemical dissolution, electrochemical dissolution and electrode reaction. Cathode rust removal is the mechanical stripping of chemically dissolved and cathode-produced hydrogen. The rust removal process for chemical nickel plating is basically the same as that for electroplating.3, resuming: resuming is the surface on which the part can be fully resemated, and this acid erosion is different for the acid used in parts of different materials. The general steel parts of the revitalization can be carried out with 10% sulphuric acid or 1:1 hydrochloric acid, the standard of the revitalization is generally the surface of the work piece out of small uniform bubbles. The activeness of stainless steel can increase the concentration of acid and heat it for acid erosion. Strictly speaking, the chemical nickel plating of stainless steel should be flashed and then chemically nickel plated, that is, the bottom layer of an electrolyte nickel or electrolyte copper should be hit first.
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