Normal-temperature phosphating process
A normal temperature, process technology, applied in the field of phosphating treatment, can solve the problems of restricting mass production of products, weak combination of phosphating film, low corrosion resistance of phosphating film, etc., and achieve high production efficiency, short processing time, crystallization uniform effect
Active Publication Date: 2014-12-10
CHONGQING GEARBOX
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Problems solved by technology
At present, the traditional domestic phosphating process at room temperature has the advantages of no need for heating, saving phosphate and stable solution; however, its phosphating film has low corrosion resistance, weak phosphating film bonding, long processing time, and low production efficiency. Severely restricts the mass production of products and has certain production limitations
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[0033] The invention discloses a normal temperature phosphating process to improve the corrosion resistance and bonding firmness of the phosphating film, reduce processing time and improve production efficiency.
[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0035] See figure 1 , figure 1 It is a schematic structural diagram of the room temperature phosphating process provided in the first embodiment of the present invention.
[0036] The room temperature phosphating process provided i...
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The invention discloses a normal-temperature phosphating process which comprises the steps of: 1, settling, cleaning and filtering a phosphating solution, regulating the phosphating solution to ensure that the proportion of free acidity to total acidity is 1:(20-30), wherein the phosphating solution comprises the following raw materials of 60-90g / l of manganese dihydrogen phosphate, 70-120g / l of zinc nitrate, 2-4g / l of sodium nitrite and 0.2-0.5ml / l of hydrogen peroxide, wherein the solvent is water; 2, phosphating a workpiece in the phosphating solution; 3, washing the phosphating solution remained on the surface of the workpiece in a washing mode; and 4, neutralizing the workpiece in an alkaline solution. According to the normal-temperature phosphating process, by steps of adopting the special phosphating solution and regulating the proportion of the free acidity to the total acidity of the phosphating solution, under the conditions of no need of heating, simple components of the solution and convenience in operation, a film is rapidly formed, and a gray black or deep gray black phosphating film with the characteristics of corrosion resistance, greatly improved wear resistance, uniformity in crystallization, firmness and compactness and complete shape is obtained rapidly.
Description
Technical field [0001] The technical field of the phosphating treatment method of the present invention, more specifically, relates to a normal temperature phosphating process. Background technique [0002] Phosphating (phosphorization) is a process of forming a phosphate chemical conversion film by chemical and electrochemical reactions. The phosphate conversion film formed is called a phosphate film. The main purpose of phosphating is: to provide protection to the base metal and prevent the metal from being corroded to a certain extent; for primer before painting to improve the adhesion and anti-corrosion ability of the paint film; to reduce friction in the metal cold working process Use for lubrication. Phosphating treatment technology has been applied to industry for more than 90 years. It can be roughly divided into three periods: the period of laying the foundation of phosphating technology, the period of rapid development of phosphating technology and the period of wide a...
Claims
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IPC IPC(8): C23C22/18C23C22/73
Inventor 余敏赵芸
Owner CHONGQING GEARBOX