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Trivalent black chromium electroplating solution for solar heat collector

A solar collector and electroplating solution technology, applied in the field of electroplating, can solve the problems of poor bonding performance of trivalent chromium electroplating coating and substrate, affecting the corrosion resistance of metal layer, and easy cracking of the coating, and achieving excellent spectral selection. performance, improve coverage, and improve binding performance

Active Publication Date: 2020-06-30
GUANGZHOU SANFU NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the hexavalent chromium plating solution is gradually replaced by the trivalent chromium plating solution due to its high toxicity. However, compared with the hexavalent chromium plating coating, at present, the trivalent chromium plating coating has poor bonding performance with the substrate. , the coating is prone to cracking and falling off, which will affect the corrosion resistance of the bottom layer of the black chrome coating or the base metal layer

Method used

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  • Trivalent black chromium electroplating solution for solar heat collector
  • Trivalent black chromium electroplating solution for solar heat collector

Examples

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Effect test

Embodiment 1

[0022] The trivalent black chromium electroplating solution for the solar heat collector described in the embodiment of the present invention is composed as follows: 10g / L chromium sulfate hexahydrate, 10g / L chromium potassium sulfate, 50g / L sodium sulfate, 50g / L ammonium sulfate, 50g / L sulfuric acid Potassium, 54g / L boric acid, 6g / L sodium citrate, 5g / L citric acid, 25g / L salicylic acid, cysteine ​​2g / L, potassium thiocyanate 1g / L, 0.1g / L succinic acid di Sodium isooctyl sulfonate, 0.1 g / L PEG600, and the above-mentioned components of the embodiment of the present invention are uniformly mixed, and water is added to obtain an electroplating solution.

Embodiment 2

[0024] The trivalent black chromium electroplating solution for the solar heat collector described in the embodiment of the present invention is composed as follows: 25g / L chromium sulfate hexahydrate, 10g / L chromium potassium sulfate, 100g / L sodium sulfate, 80g / L ammonium sulfate, 63g / L boric acid , 7g / L sodium citrate, 15g / L citric acid, 35g / L salicylic acid, cysteine ​​3g / L, potassium thiocyanate 1g / L, 0.25g / L diisooctyl sodium sulfosuccinate , 0.25g / LPEG200, mix the above-mentioned components of the embodiment of the present invention evenly, add water, and obtain the electroplating solution.

Embodiment 3

[0026] The trivalent black chromium electroplating solution for the solar heat collector described in the embodiment of the present invention is composed as follows: 35g / L chromium sulfate hexahydrate, 10g / L chromium potassium sulfate, 80g / L sodium sulfate, 50g / L ammonium sulfate, 50g / L sulfuric acid Potassium, 77.3g / L boric acid, 7.7g / L sodium citrate, 20g / L citric acid, 30g / L salicylic acid, cysteine ​​3.5g / L, potassium thiocyanate 1.5g / L, 0.9g / L L diisooctyl sodium sulfosuccinate, 0.6g / L PEG600, mix the above-mentioned components of the embodiment of the present invention evenly, add water, and obtain the electroplating solution.

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Abstract

The invention provides a trivalent black chromium electroplating solution for a solar heat collector, and relates to the technical field of electroplating. The trivalent black chromium electroplatingsolution per liter comprises 20-60 g of main salt, 150-230 g of conductive salt, 60-100 g of buffer salt, 30-80 g of a complexing agent, 1.5-4 g of cysteine, 0.5-2 g of potassium thiocyanate and 0.2-2g of a wetting agent, wherein the complexing agent consists of citric acid and salicylic acid in a mass ratio of 0.5-1.5:1, and the wetting agent consists of sodium dioctyl sulfosuccinate and polyethylene glycol in a mass ratio of 1-2:1. The trivalent black chromium electroplating solution for the solar heat collector can be used for a heat absorption layer of the solar heat collector, and a plating layer has the characteristics of excellent bonding performance with a substrate, good corrosion resistance and the like.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a trivalent black chromium electroplating solution for solar heat collectors. Background technique [0002] A solar collector is a device that converts the sun's radiant energy into heat energy. Since the solar energy is relatively scattered, it needs to be concentrated, so the collector is a key part of the solar installation. Heat collectors can be divided into flat plate heat collectors, concentrating heat collectors and flat reflectors. Among them, the flat plate collector is mainly composed of heat absorbing plate, transparent cover plate, heat insulation layer and shell. At present, the main materials used for heat absorbing plates include black chrome coating, anodized coating and blue film coating. [0003] Among them, the service life of the anodized coating is short and the spectral selectivity is not stable, which limits its use. The production equipment of ...

Claims

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Application Information

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IPC IPC(8): C25D3/06C25D3/08
CPCC25D3/06C25D3/08
Inventor 田志斌詹益腾邓正平胡明
Owner GUANGZHOU SANFU NEW MATERIALS TECH
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