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Tin plating and tin removing solution formula and process for plating tin on surface of part

A technology of tin plating solution and formula, which is applied in the field of tin plating and tin removal solution formula and technology, to achieve the effects of improving cathodic polarization and dispersing ability, facilitating operation, and improving coating performance

Pending Publication Date: 2022-04-12
XIAN AERO ENGINE CONTROLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing part design drawing requires that the hardness of the surface of copper alloy parts be significantly increased from about HB160 to ≥600HV, and the technical requirements can be met by tinning the surface and strengthening by heat treatment and diffusion, but the current electrolytic tinning method cannot meet the technical requirements. Therefore it is imperative to develop a tin-plating and tin-removing solution formula and a process that can meet the technical requirements

Method used

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  • Tin plating and tin removing solution formula and process for plating tin on surface of part
  • Tin plating and tin removing solution formula and process for plating tin on surface of part
  • Tin plating and tin removing solution formula and process for plating tin on surface of part

Examples

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Effect test

Embodiment 1

[0030] In this embodiment, the material is electroplated tin on the surface of copper alloy parts of QSb3.5, and the tin plating solution adopted includes the sulfuric acid that the concentration is 45g / L stannous sulfate, 80g / L, gelatin 2g / L, 8g / L tin Phenol, 0.4g / L nickel sulfate. The tin removal solution used included 180g / L sodium hydroxide, 70g / L sodium m-nitrobenzenesulfonate, 40g / L lead acetate, 15g / L sodium citrate, and 1.5mL / L polyethylene glycol. The above-mentioned concentration data all refer to the mass of each substance in every liter of water, such as stannous sulfate with a concentration of 45g / L means that every liter of water contains 45g of stannous sulfate.

[0031] Tin-plate its surface by the following steps:

[0032] First, wash the parts with a neutral degreasing solution (okatite90);

[0033] Secondly, hang the cleaned parts and use CrO 3 : 50-60g / L, H 2 SO 4 : 200-220g / L solution, at a temperature of 40-60°C, for 3-5 minutes for photochemical tre...

Embodiment 2

[0041]Different from Example 1, the tin plating solution used in this example includes the concentration of 40g / L of stannous sulfate, 100g / L of sulfuric acid, 1g / L of gelatin, 5g / L of phenol, 0.5g / L nickel sulfate. The tin removal solution used included 150g / L sodium hydroxide, 80g / L sodium m-nitrobenzenesulfonate, 30g / L lead acetate, 10g / L sodium citrate, and 2.0mL / L polyethylene glycol.

[0042] Tin-plate its surface by the following steps:

[0043] First, wash the parts with a neutral degreasing solution (okatite90);

[0044] Secondly, hang the cleaned parts and use CrO 3 : 50-60g / L, H 2 SO 4 : 200-220g / L solution, at a temperature of 40-60°C, for 3-5 minutes for photochemical treatment;

[0045] After that, the actinized parts are electroplated in the above tin plating solution at a temperature of 38°C; the current density is 2A / dm 2 ; The time is 40 minutes. After tin plating, check that the appearance of the coating is uniform, meticulous and continuous. The thic...

Embodiment 3

[0052] Different from Example 1, the tin-plating solution used in this example includes a concentration of 50g / L stannous sulfate, 60g / L sulfuric acid, 3g / L gelatin, 10g / L phenol, 0.2g / L nickel sulfate. The tin removal solution used included 200g / L sodium hydroxide, 60g / L sodium m-nitrobenzenesulfonate, 50g / L lead acetate, 20g / L sodium citrate, and 1.0mL / L polyethylene glycol.

[0053] Tin-plate its surface by the following steps:

[0054] First, wash the parts with a neutral degreasing solution (okatite90);

[0055] Secondly, hang the cleaned parts and use CrO 3 : 50-60g / L, H 2 SO 4 : 200-220g / L solution, at a temperature of 40-60°C, for 3-5 minutes for photochemical treatment;

[0056] After that, the actinized parts are electroplated in the above tin plating solution at a temperature of 20°C; the current density is 5A / dm 2 ; The time is 50 minutes. After tin plating, check that the appearance of the coating is uniform, meticulous and continuous. The thickness of the ...

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Abstract

The invention belongs to the field of surface treatment, and relates to a tin plating and removing solution formula and a process for plating tin on the surface of a part, and the hardness of the surface of a copper alloy part is obviously improved to be greater than or equal to 600HV from about HB160. The formula of the tin plating solution comprises water, stannous sulfate with the concentration of 40-50 g / L, sulfuric acid with the concentration of 60-100 g / L, gelatin with the concentration of 1-3 g / L, phenol with the concentration of 5-10 g / L and nickel sulfate with the concentration of 0.2-0.5 g / L; the formula of the tin removal solution comprises water, (150-200) g / L of sodium hydroxide, (60-80) g / L of sodium metanitrobenzene sulfonate, (30-50) g / L of lead acetate, (10-20) g / L of sodium citrate and (1-2) mL / L of polyethylene glycol. The process comprises the steps of cleaning and oil removal, acid pickling, electrotinning, diffusion treatment and the like. By adjusting the formula of the tinning solution, a deposited coating is more compact, meanwhile, the polarization effect and the dispersing capacity of a cathode are improved, coating crystals are fine and glossy, metal impurities can be masked, and the performance of the coating can be improved. And the hardness of the surface of the copper alloy part is obviously improved to be greater than or equal to 600HV from about HB160, and meanwhile, the plating layer has good performance.

Description

technical field [0001] The invention belongs to the field of surface treatment and relates to a tinning and tin removal solution formula and process. Background technique [0002] Tin, due to its non-toxicity and excellent corrosion resistance, is the material of choice for the manufacture of a wide variety of products, including fuses, automotive connectors, heavy-duty switchgear and precision electronic components. At the same time, tin also has the advantages of good discoloration resistance, corrosion resistance, softness, low melting point and good ductility. It can be processed by a special pre-plating process to form a firm, dense, smooth, continuous and uniform on the surface of the base metal material. Alloy coating to achieve the purpose of improving the physical and chemical properties of the metal base material. [0003] Tin can be deposited on the surface of the metal substrate by means of electroplating, hot-dip plating and electroless plating to form a dense ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/30C25D5/34C25F5/00
Inventor 吴雨桥刘静王曦张鲜君吴晓伟张立
Owner XIAN AERO ENGINE CONTROLS
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