Zinc chemical surface treatment process

A chemical surface treatment and process technology, which is applied in the direction of metal material coating process, superimposed layer plating, coating, etc., can solve the problem that screws cannot cooperate with nuts, etc., and achieve good anti-rust effect and no zinc slag , surface bright effect

Inactive Publication Date: 2016-03-30
洪求耀
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of the hot-dip galvanizing process is that the thickness of the zinc layer is good and the anti-rust effect is good. The disadvantage is that zinc slag and zinc flow will form on the surface of the workpiece after plating. For screw workpieces, the zinc slag and zinc flow will cause the screw to fail to cooperate with the nut. as a result of

Method used

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Embodiment Construction

[0020] The present invention is a zinc chemical surface treatment process for a steel screw workpiece, which is processed according to the following steps, and the value can be selected according to the specific situation within the provided value range, and it can achieve a good zinc surface of the steel screw workpiece Chemical treatment effect.

[0021] A: Degrease, derust, wash and dry the surface of the steel screw workpiece; that is, use common organic solvent degreasing, chemical degreasing, mechanical degreasing or wipe degreasing; surface derusting uses common chemicals Pickling or mechanical derusting methods, such as rolling, brushing, sandblasting or shot blasting and other mechanical methods. The steel pillow after degreasing and rust removal is washed and dried with water to obtain a clean and dry steel screw workpiece;

[0022] B: Preparation of sherardizer: mix zinc powder, nano cerium oxide powder, ammonium chloride as activator and alumina as filler in a certain ...

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Abstract

The invention provides a zinc chemical surface treatment technology, which is characterized in that: the zinc chemical surface treatment technology comprises the following steps of: carrying out deoiling, rust-removing, washing and drying treatment for surfaces of a steel screw workpiece; preparing a zinc penetrating agent; carrying out zinc penetrating treatment on the steel screw workpiece; cooling the steel screw workpiece; carrying out flushing and polishing treatment, passivating treatment and air-drying treatment on the steel workpiece; and electroplating the steel screw workpiece at 20-30 DEG C under a condition of 2.0A / dm2 of current density, wherein the steel screw workpiece needed to be electroplated is used as a cathode, a zinc plate is used as an anode, an area ratio of the anode to the cathode is 2:1, and an electroplating solution is an alkaline and cyanide-free galvanizing solution. The zinc chemical surface treatment technology combines the zinc penetrating technology and a galvanizing technology to carry out surface treatment on a steel screw, and combines advantages of the two technologies, and the treated steel screw has advantages of brightening surface, no zinc slag, no zinc flow, accurate dimension, good zinc layer thickness and good antirust effect.

Description

Technical field [0001] The invention belongs to a surface treatment process for steel parts. Background technique [0002] At present, there are two main processes for surface treatment of steel screw workpieces: [0003] In the sherardizing process, the sherardizer and steel parts are placed in a sherardizing furnace and heated to about 400°C, and the active zinc atoms penetrate into the steel parts from the surface to the inside. At the same time, the iron atoms diffuse from the inside to the outside, which forms a zinc-iron intermetallic compound on the surface of the steel part, that is, the galvanized layer. The disadvantage of the sherardizing process is that the surface after treatment is gray and not bright, and the advantage is that the thickness of the zinc layer after treatment is thicker. [0004] The cold galvanizing process uses electrolysis equipment to remove oil, pickling, and then put the workpiece in a solution containing zinc salt, and connect it to the negative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/02C23C10/36C25D3/22
Inventor 洪求耀
Owner 洪求耀
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