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An additive for a mechanical deposition cadmium

A technology of mechanical deposition and additives, which is applied in the field of metal coating and metal surface treatment on steel substrates, can solve the problems of low effective utilization rate of cadmium powder, slow deposition speed of cadmium powder, unstable deposition process, etc., and achieve stable deposition and coating Fast thickening and uniform adsorption effect

Active Publication Date: 2020-05-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the different electrode potentials of zinc and cadmium, as well as the difference in the potential ordering positions of zinc, cadmium and iron electrodes, the traditional principle of mechanical deposition of zinc and the activator of mechanical deposition of zinc cannot be copied to the mechanical deposition process of cadmium.
Tests have shown that when cadmium is plated by mechanical deposition of zinc, the deposition rate of cadmium powder is slow, and the thickness of the coating is less than 10 μm after cadmium powder is added for 10 minutes. The deposition process is unstable, and the effective utilization rate of cadmium powder is lower than 50%. To obtain the desired thickness of the coating
Literature search at home and abroad shows that there are very few relevant studies on the mechanical deposition of cadmium process, additives, process principles, etc.

Method used

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  • An additive for a mechanical deposition cadmium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The components and mass percentages of the additive for rapid mechanical deposition of cadmium described in this embodiment are: butynediol 1%, emulsifier OP-10 4%, citric acid 10%, sodium lignosulfonate 3%, malic acid Sodium 0.5%, cadmium sulfate 3%, stannous chloride 18%, water 60.5%.

[0027] The additive for fast mechanical deposition of cadmium described in this embodiment is used for mechanical deposition of cadmium coating on the surface of iron and steel parts. The workpiece to be plated is 200 kg of standard flat gaskets with a thickness of Φ24 mm and a thickness of 3.0 mm. 10 μm. When plating, the pretreated gasket is used to establish a cadmium-tin base layer, and then 1360g of cadmium powder is added to the plating cylinder, and then 680ml of the prepared additive aqueous solution is added to the plating cylinder, and the plating cylinder continues to rotate for 5 minutes; after that, unloading, separation, The surface of the gasket gets a bright silver-whi...

Embodiment 2

[0031] The components and mass percentages of the additive for rapid mechanical deposition of cadmium described in this embodiment are: butynediol 3%, emulsifier OP-10 2%, citric acid 6%, sodium lignosulfonate 5%, malic acid Sodium 2%, cadmium sulfate 10%, stannous chloride 12%, water 10%.

[0032] The additive for rapid mechanical deposition of cadmium described in this example is used for mechanical deposition of cadmium coating on the surface of iron and steel parts. The workpiece to be plated is 200 kg of M16 grade 8.8 standard bolts, the surface area to be plated is 8.6 m2, and the required coating thickness is 20 μm. When plating, the pretreated bolts are used to establish a cadmium-tin base layer, and then 688g of cadmium powder is added to the plating cylinder, and then 800ml of the prepared additive aqueous solution is added to the plating cylinder, and the plating cylinder continues to rotate for 4 minutes; 688g of cadmium is added to the plating cylinder again powde...

Embodiment 3

[0036] The components and mass percentages of the additive for rapid mechanical deposition of cadmium described in this embodiment are: butynediol 2%, emulsifier OP-10 1.5%, citric acid 8%, sodium lignosulfonate 4%, malic acid Sodium 1%, cadmium sulfate 5%, stannous chloride 10%, water 68.5%.

[0037] The additive for fast mechanical deposition of cadmium described in this embodiment is used for mechanical deposition of cadmium coating on the surface of iron and steel parts. The workpiece to be plated is 200 kg of standard flat gaskets with a thickness of Φ20mm and a thickness of 3.0 mm. The surface area to be plated is about 21㎡, and the thickness of the coating is required to be 10 μm. When plating, the pretreated gasket is used to establish a cadmium-tin base layer, and then 840g of cadmium powder is added to the plating cylinder, and then 470ml of the prepared additive aqueous solution is added to the plating cylinder, and the plating cylinder continues to rotate for 4 min...

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Abstract

The invention discloses an additive for mechanically depositing cadmium, and belongs to the technical field of metal surface protection. The additive comprises the following components in percentagesby mass: 1%-3% of butynediol, 1.5%-4% of an emulsifier OP-10, 6%-10% of citric acid, 3%-5% of sodium lignin sulfonate, 0.5%-2% of sodium malate, 3%-10% of cadmium sulfate, 10%-18% of stannous chlorideand the balance of water. During plating, by the components of the additive, it can be ensured that the surfaces of a matrix and cadmium powder are clean, the cadmium powder is controlled to have a suitable agglomeration size, metal ions are strongly adsorbed and chelated, and plating layer deposition with the thickness being 10 mu m can be obtained within a short time (3-5 min).

Description

technical field [0001] The invention relates to an additive for mechanically depositing cadmium, which belongs to the technical field of metal surface treatment and is used for mechanically depositing cadmium coatings on the surface of iron and steel parts. Specifically, it belongs to the technical field of metal coating on iron and steel substrates. Background technique [0002] Cadmium plating has potential environmental pollution, and the coating is prone to hydrogen embrittlement and cadmium embrittlement. However, due to its excellent corrosion resistance in marine environments, cadmium plating is still the main protective measure for steel-based components used in marine engineering equipment. Especially for the surface protection of fasteners and connectors used in ship equipment, cadmium plating is still the main first choice; the current cadmium plating basically adopts the electroplating cadmium process, 300M, 30CrMnSiNi2A, A-100 and other high-strength steel bolts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/02
CPCC23C24/02
Inventor 侯云波王胜民赵晓军裴和中谭蓉宋鹏黄国雄
Owner KUNMING UNIV OF SCI & TECH
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