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Clean rare-earth salt passivation solution

A technology of rare earth salt and passivation solution, which is applied in the coating process of metal materials, etc., can solve the problems of lack of corrosion resistance and high cost of chromate passivation, and achieve clean production, overcome high toxicity and passivation Process stable and reliable effect

Inactive Publication Date: 2011-04-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the chromium-free passivation on galvanized and its alloy layers at home and abroad mainly includes molybdate passivation, rare earth salt passivation, silicate passivation, phytic acid passivation and organic passivation, etc., but these chromium-free passivation The passivation effect of the technology is not as good as the corrosion resistance of chromate passivation, or the cost is too high, so that there is no chromium-free passivation process to completely replace the chromate passivation process

Method used

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  • Clean rare-earth salt passivation solution
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Examples

Experimental program
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Effect test

Embodiment 1

[0011] Embodiment 1: The passivation process is used to perform subsequent passivation treatment on a partially galvanized steel sheet.

[0012] The steel plate is subjected to pretreatments such as rust removal, degreasing and activation before electroplating, and then it is put into the electroplating bath for electroplating. The bath composition and operating conditions of the galvanizing process are: ZnCl 2 80g / L, KCl 200g / L, proper amount of additives, the pH value of the plating solution is maintained at about 5.5, and the current density is 1.2A / dm 2 , The temperature is room temperature, and the plating time is 25 minutes.

[0013] Formulated by HNO 3 2ml / L and H 2 The light-emitting liquid composed of O and 15g / L of cerous chloride, K 2 S 2 O 8 2g / L, Na 2 SiO 3 .3H 2 O 2g / L, H 3 BO 3 2g / L, H 2 O 2 5ml / L, HCl 5ml / L and H 2 The passivation solution composed of O, adjust the pH value to 2.8 with dilute HCl or NaOH solution, and then take out the plated steel plate, after cleani...

Embodiment 2

[0015] Embodiment 2: The passivation process is used to perform subsequent passivation treatment on the steel plate partially electroplated with Zn-Fe alloy.

[0016] Before passivation, the steel plate is electroplated after pretreatment (rust removal, degreasing, activation). The composition and operating conditions of the zinc-iron alloy electroplating process are: ZnCl 2 100g / L, KCl 230g / L, FeSO 4 ·7H 2 O10g / L, ascorbic acid 1.2g / L, appropriate amount of additives, pH 4.0, cathode current density 1.8A / dm 2 The temperature is room temperature, the electroplating time is 40 minutes, and the iron content in the obtained Zn-Fe alloy coating is 0.5%.

[0017] Formulated by HNO 3 3ml / L and H 2 The light-emitting liquid composed of O and 25g / L of cerium nitrate, K 2 S 2 O 8 4g / L, Na 2 SiO 3 .3H 2 O 3g / L, H 3 BO 3 3g / L, H 2 O 2 10ml / L, HCl 10ml / L and H 2 The passivation solution composed of O, adjust the pH value to 2.4 with dilute HCl or NaOH solution, and then take out the plated stee...

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Abstract

The invention discloses a clean rare-earth salt passivation solution, mainly used for post treatment of galvanizing and zinc-iron alloy, belonging to the technical field of metal material surface treatment. The passivation solution is composed of rare-earth salts, K2S2O8, Na2SiO3, H3BO3, H2O2, HCl and H2O, and is a chromium-free, toxic substance-free, stable and reliable passivation solution at a low cost. After passivation, a compact passive film is formed on the surface of the zinc or zinc-iron alloy electroplating coating, thus improving the corrosion resistance of the parts coated with zinc or Zinc-Fe alloy. The corrosion resistance of the zinc or zinc-iron alloy electroplating coating treated by the passivation solution is remarkably improved, and the clean rare-earth salt passivation solution has the advantages of cleanness, environmental protection, economy and practicality, good use effect and the like.

Description

Technical field [0001] The invention relates to an electrolytic zinc and zinc-iron alloy clean passivation, which is mainly used for the post-treatment process of electroplating zinc and zinc-iron alloy on the surface of steel parts, and belongs to the technical field of surface treatment of metal materials. Background technique [0002] Corrosion and anti-corrosion are related to economic development and people's life safety. Surface engineering technology is the most economical and effective means and method to solve the corrosion and protection of mechanical parts and materials. [0003] Galvanizing and zinc-iron alloys are effective ways to improve the corrosion resistance of steel parts, and are currently widely used in many fields such as shipbuilding, machinery industry, aviation, and construction. However, in a humid environment, especially in a hot and humid environment, the galvanized and zinc-iron alloy layers are prone to corrosion, causing dark gray or white loose corr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/48C23C22/50C23C22/53
Inventor 张英杰章江洪董鹏郑帅闫宇星
Owner KUNMING UNIV OF SCI & TECH