Self-lubricating chromium-free passivator and preparation method thereof

A chrome-free passivation and self-lubricating technology, applied in the direction of metal material coating process, can solve the problems of hard bonding of metal plates, affecting the coating performance of galvanized plates, etc., so as to save production costs and simplify the process. effect of the process

Active Publication Date: 2015-03-25
武汉迪赛新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 103289569 A and CN 103290401 A respectively report a preparation method of a self-lubricating chromium-free passivation solution, but this preparation method is realized by adding polytetrafluoroethylene emulsion and molybdenum sulfide, and polytetrafluoroethylene will affect The subsequent coating performance of the galvanized sheet makes it difficult for the coating to bond firmly with the metal sheet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of self-lubricating chromium-free passivator, the steps are as follows:

[0036] Mix 20g of cerium nitrate and ammonium phosphomolybdate (4g of cerium nitrate + 16g of ammonium phosphomolybdate), 50g of silicone-modified water-based polyurethane emulsion, 6g of lubricant (5g of calcium stearate emulsion + 1g of Onkel E624 wax Emulsion), 40g of silica sol, 7g of 30wt% hydrogen peroxide were mixed, then replenished to 1L with deionized water, and finally adjusted to pH=1 with 6M nitric acid (the amount of 6M nitric acid was less than 10ml), to get final product.

[0037] Dilute it with deionized water at a ratio of 1:5 to obtain a passivation working solution.

[0038] Take the galvanized parts out of the electroplating tank, rinse them in 3wt% dilute nitric acid, rinse twice in deionized water, and then put them into the prepared passivation solution. The passivation time is 30s. After bathing, dry at 100°C for 10 minutes. Neutral salt spray test (...

Embodiment 2

[0040] A preparation method of self-lubricating chromium-free passivator, the steps are as follows:

[0041] Mix 40g of cerium nitrate and ammonium phosphomolybdate (10g of cerium nitrate and +30g of ammonium phosphomolybdate), 30g of silicone-modified water-based polyurethane emulsion, 10g of lubricant (7.5g of calcium stearate emulsion+2.5g of Wengkai Er E624 wax emulsion), 20g of silica sol, 5g of 30wt% hydrogen peroxide were mixed, then replenished to 1L with deionized water, and finally adjusted to pH = 1 with 6M nitric acid (the amount of 6M nitric acid was less than 10ml).

[0042] Passivator usage method is the same as embodiment 1.

[0043] The performance of the galvanized layer after passivation: neutral salt spray test (white rust area): about 8% in 96 hours, fingerprint resistance test: excellent (⊿E≦3), surface coating adhesion: 0 grade, friction coefficient : 0.07.

Embodiment 3

[0045] A preparation method of self-lubricating chromium-free passivator, the steps are as follows:

[0046]Mix 50g of cerium nitrate and ammonium phosphomolybdate (10g of cerium nitrate and +40 ammonium phosphomolybdate), 20g of silicone-modified water-based polyurethane emulsion, 12g of lubricant (8g of zinc stearate emulsion+4g of Onkel E624 Wax emulsion), 25g of silica sol, 8g of 30wt% hydrogen peroxide were mixed, then replenished to 1L with deionized water, and finally adjusted to pH=1 with 6M nitric acid (the consumption of 6M nitric acid was less than 10ml).

[0047] Passivator usage method is the same as embodiment 1.

[0048] Performance of galvanized layer after passivation: neutral salt spray test (white rust area): about 9% in 96 hours, fingerprint resistance test: excellent (⊿E≦3), surface coating adhesion: 0 grade, friction coefficient : 0.07.

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Abstract

The invention belongs to the technical field of inorganic-organic composite materials and particularly discloses a self-lubricating chromium-free passivator and a preparation method thereof. The self-lubricating chromium-free passivator per liter comprises the following components: 20-100g of a mixture of cerium nitrate and ammonium phosphomolybdate, 5-50g of a coalescing agent, 6-20g of a lubricant, 20-40g of silica sol, 5-10g of an oxidant, an appropriate amount of a pH adjusting agent and the balance of water, wherein the appropriate amount of the pH adjusting agent is used for adjusting the pH of the self-lubricating chromium-free passivator to 1. By the passivator having self-lubricating property disclosed by the invention, the problem of the environmental pollution caused by hexavalent chromium contained in the hexavalent chromium passivator is solved, the passivated steel plate does not need to be subjected to lubrication treatment during press molding and furthermore, the steel plate subjected to press molding can be directly coated, and thus the steps during the galvanized sheet processing and application are decreased.

Description

technical field [0001] The invention relates to the technical field of inorganic-organic composite materials, in particular to a self-lubricating chromium-free passivator for galvanized steel sheets and a preparation method thereof. Background technique [0002] When the galvanized steel sheet treated with a passivating agent is stamped and formed, in order to prevent the tensile damage and fracture of the corners and other places during the stamping process, lubricating oil is usually applied to the steel plate to reduce the frictional resistance of the steel plate during the stamping process. When the stamped steel plate is painted again, this layer of lubricating oil must be degreased and cleaned. In this way, a process is added between stamping forming and coating treatment, and this cleaning process may also reduce the corrosion resistance of the passivation layer of the galvanized sheet. Therefore, if the galvanized steel sheet itself has self-lubricating properties a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42
Inventor 陆飚
Owner 武汉迪赛新材料有限公司
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