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A kind of pretreatment method of low-silver-lead alloy surface

A lead alloy and pretreatment technology, applied in the field of metal surface treatment, can solve problems such as high risk, and achieve the effect of simple composition, convenient preparation, and wide range of process parameters

Active Publication Date: 2016-05-11
KUNMING HENDERA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Therefore, the operation process is more dangerous

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  • A kind of pretreatment method of low-silver-lead alloy surface

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Effect test

Embodiment 1

[0020] Such as figure 1 Shown, the pretreatment method of this low-silver-lead alloy surface, its concrete steps are as follows:

[0021] (1) First, mechanically polish the surface of the low-silver-lead alloy. After polishing, wash it twice with deionized water. The mass percentage of silver in the low-silver-lead alloy is 0.3%. The surface of the low-silver-lead alloy is smooth;

[0022] (2) Put the low-silver-lead alloy treated in step (1) into an alkaline solution, degrease at 60°C for 5 minutes, and then wash it twice with deionized water. The components of the alkaline solution It is sodium hydroxide, trisodium phosphate, sodium silicate and distilled water. The ratio of the mass of sodium hydroxide to the volume of distilled water is 15:1g / L, and the ratio of the mass of trisodium phosphate to the volume of distilled water is 20:1g / L , the ratio of the mass of sodium silicate to the volume of distilled water is 5:1g / L;

[0023] (3) Put the low-silver-lead alloy treat...

Embodiment 2

[0026] Such as figure 1 Shown, the pretreatment method of this low-silver-lead alloy surface, its concrete steps are as follows:

[0027] (1) First, mechanically polish the surface of the low-silver-lead alloy. After polishing, wash it twice with deionized water. The mass percentage of silver in the low-silver-lead alloy is 1.0%. The mechanical polishing is scraping, and the degree of mechanical polishing is up to The surface of silver-lead alloy is smooth;

[0028] (2) Put the low-silver-lead alloy treated in step (1) into an alkaline solution, degrease at 80°C for 10 minutes, and then wash it twice with deionized water. The components of the alkaline solution It is sodium hydroxide, trisodium phosphate, sodium silicate and distilled water, wherein the ratio of the mass of sodium hydroxide to the volume of distilled water is 25:1g / L, and the ratio of the mass of trisodium phosphate to the volume of distilled water is 30:1g / L L, the ratio of the mass of sodium silicate to th...

Embodiment 3

[0032] Such as figure 1 Shown, the pretreatment method of this low-silver-lead alloy surface, its concrete steps are as follows:

[0033] (1) First, mechanically polish the surface of the low-silver-lead alloy. After the polishing is completed, wash it twice with deionized water. The mass percentage of silver in the low-silver-lead alloy is 0.5%. The mechanical polishing is grinding, and the degree of mechanical polishing is until low The surface of silver-lead alloy is smooth;

[0034] (2) Put the low-silver-lead alloy treated in step (1) into an alkaline solution, remove grease for 8 minutes at a temperature of 70°C, and then wash it twice with deionized water. The components of the alkaline solution It is sodium hydroxide, trisodium phosphate, sodium silicate and distilled water. The ratio of the mass of sodium hydroxide to the volume of distilled water is 20:1g / L, and the ratio of the mass of trisodium phosphate to the volume of distilled water is 25:1g / L , the ratio of ...

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Abstract

The invention relates to a pretreatment method for a low silver-lead alloy surface, and belongs to the technical field of metal surface treatment. The pretreatment method comprises the following steps: firstly, mechanically polishing the low silver-lead alloy surface, washing for twice by using deionized water after the polishing is accomplished, putting the low silver-lead alloy surface treated by the steps into an alkali solution, degreasing at the temperature of 60-80 DEG C, subsequently washing for twice by using the deionized water, putting the low silver-lead alloy surface treated by the steps into an acid etching liquid, etching for 5-10 minutes at the room temperature, subsequently washing for twice by using the deionized water, polishing and blowing to dry the low silver-lead alloy surface treated by the steps by using a low silver-lead alloy acid polishing liquid at the room temperature, so as to obtain a bright, flat and clean low silver-lead alloy surface which is necessary for composite electrodeposition. A pretreatment solution is simple in component, convenient to prepare, easy to control, wide in process parameter range, and free from over-corrosion.

Description

technical field [0001] The invention relates to a pretreatment method for the surface of a low-silver-lead alloy, belonging to the technical field of metal surface treatment. Background technique [0002] Low-silver-lead alloys have the characteristics of easy forming and high stability in sulfuric acid medium, and are widely used as anodes in the hydrometallurgical electrowinning process of non-ferrous metals such as zinc and copper, but there are disadvantages such as high production power consumption, and large-scale The production of precious metal silver consumes a large amount, and the anode manufacturing cost is high. Make full use of the synergistic advantages of multi-component composite materials and the technical advantages of electrodeposition to prepare multiple composite active materials such as lead dioxide on the surface of low-silver-lead alloys, which can not only exert the catalytic activity of silver in the matrix, but also effectively reduce the amount o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/34
Inventor 徐瑞东何世伟孔营
Owner KUNMING HENDERA SCI & TECH
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