Bright type cyanide-free zinc plating solution and preparation method thereof

A galvanizing liquid and bright technology, which is applied in the field of electroplating liquid, can solve the problems of brittle coating, over-thick coating, etc., and achieve the effect of fine crystallization, good coverage and fast light emission speed of the coating

Inactive Publication Date: 2015-12-09
HUZHOU FANGMING ENVIRONMENT PROTECTION TECHCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to thicken the coating to ensure the thickness of the coating in the low current density area, causing the coating to be too thick in the high current density area, causing the coating to be brittle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A novel cyanide-free zinc plating solution, which consists of the following components:

[0033] 1. Sodium hydroxide: 120g / L

[0034] 2. Zinc oxide: 6g / L

[0035] 3. Cyanide salt: 20g / L

[0036] 4. Cylinder opening agent: 15l / L

[0037] 5. Walking agent: 7ml / L

[0038] 6. Brightener: 3ml / L

[0039] 7. Tea saponin: 0.6 / L.

[0040] The working condition of described cyanide-free alkaline galvanizing solution is:

[0041] Temperature: 15-50°C

[0042] DK: 0.5-5A / cm2 (current density).

[0043] The preparation method of described cyanide-free alkaline zinc-plating solution is:

[0044] Step 1, 1 is dissolved in pure water;

[0045] Step 2, dissolve 2 in water and adjust it into a paste;

[0046] Step 3, dissolve step 2 into step 1, and control the temperature above 80 degrees until completely dissolved;

[0047] Step 4. When the liquid prepared in step 3 is cooled to below 40 degrees, add 3, because 3 is easy to decompose at high temperature, so it needs to be co...

Embodiment 2

[0050] A novel cyanide-free zinc plating solution, which consists of the following components:

[0051] 1. Sodium hydroxide: 80g / L

[0052] 2. Zinc oxide: 12g / L

[0053] 3. Cyanide salt: 20g / L

[0054] 4. Cylinder opening agent: 19ml / L

[0055] 5. Walking agent: 7ml / L

[0056] 6. Brightener: 2ml / L

[0057] 7. Tea saponin: 0.8 / L.

[0058] The working condition of described cyanide-free alkaline galvanizing solution is:

[0059] Temperature: 15-50°C

[0060] DK: 0.5-5A / cm2 (current density).

[0061] The preparation method of described cyanide-free alkaline zinc-plating solution is:

[0062] Step 1, 1 is dissolved in pure water;

[0063] Step 2, dissolve 2 in water and adjust it into a paste;

[0064] Step 3, dissolve step 2 into step 1, and control the temperature above 80 degrees until completely dissolved;

[0065] Step 4. When the liquid prepared in step 3 is cooled to below 40 degrees, add 3, because 3 is easy to decompose at high temperature, so it needs to be c...

Embodiment 3

[0068] A novel cyanide-free zinc plating solution, which consists of the following components:

[0069] 1. Sodium hydroxide: 100g / L

[0070] 2. Zinc oxide: 10g / L

[0071] 3. Cyanide salt: 30g / L

[0072] 4. Cylinder opening agent: 20ml / L

[0073] 5. Walking agent: 7ml / L

[0074] 6. Brightener: 3ml / L

[0075] 7. Tea saponin: 0.6 / L.

[0076] The working condition of described cyanide-free alkaline galvanizing solution is:

[0077] Temperature: 15-50°C

[0078] DK: 0.5-5A / cm2 (current density).

[0079] The preparation method of described cyanide-free alkaline zinc-plating solution is:

[0080] Step 1, 1 is dissolved in pure water;

[0081] Step 2, dissolve 2 in water and adjust it into a paste;

[0082] Step 3, dissolve step 2 into step 1, and control the temperature above 80 degrees until completely dissolved;

[0083] Step 4. When the liquid prepared in step 3 is cooled to below 40 degrees, add 3, because 3 is easy to decompose at high temperature, so it needs to be co...

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Abstract

The invention discloses a bright type cyanide-free zinc plating solution and a preparation method thereof. The zinc plating solution consists of the following components: 80-140g/L of sodium hydroxide, 6-12g/L of zinc oxide, 20-40g/L of salt substituted for cyanide,15-20ml/L of a cylinder opening agent, 6-8ml/L of a scattering agent, 2-4ml/L of a brightening agent, and 0.6-0.8/L of tea saponin. The novel cyanide-free zinc plating solution disclosed by the invention is wide in current range, high in bright dipping speed, delicate in plating crystallization, high in area coverage rate and long valid time for salt mist, and can be used for replacing conventional toxic cyanide zinc plating. The cyanide-free zinc plating solution overcomes the defects that zincate cannot directly electroplate pig iron pieces and cast iron pieces, generates white spots when electroplating high-carbon steel, and is poor in binding force. The cyanide-free zinc plating solution overcomes the defect that when conventional potassium chloride is used for electroplating, long valid time for salt mist cannot be reached.

Description

technical field [0001] The invention relates to a bright cyanide-free zinc plating solution and a preparation method thereof, belonging to the field of electroplating solutions. Background technique [0002] Alkaline cyanide-free galvanizing is called environmentally friendly galvanizing because it does not use highly toxic cyanide and the waste water is easy to treat. It conforms to the national policy of two-oriented society and has been widely used. It is beneficial to promote cyanide-free zinc plating to replace cyanide-containing zinc plating. The basic components of alkaline cyanide-free galvanizing are composed of zinc oxide, sodium hydroxide and additives. Compared with cyanide galvanizing, sodium hydroxide is an order of magnitude worse than sodium cyanide in complexing zinc, and its tolerance to impurities is low. Therefore, in order to obtain zinc coatings with fine crystals, good coverage and good dispersion, a certain amount of additives must be added to the al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/22
Inventor 徐卫民干方明
Owner HUZHOU FANGMING ENVIRONMENT PROTECTION TECHCO LTD
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