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Compound chromate-free passivator capable of forming films rapidly and preparation method

A chromium-free passivation agent and film-forming technology, which is applied in the coating process of metal materials, etc., can solve the adverse effects of the combination of the coating and the metal plate, the passivation performance of the chromium-free passivation solution is unknown, and the coating is difficult for the metal plate to be firm Combination and other issues, to achieve good shielding protection, enhance the binding force and corrosion resistance, enhance the effect of mechanical properties

Inactive Publication Date: 2018-07-20
长沙艾森设备维护技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102251239A discloses a chrome-free passivation solution based on water-based epoxy resin composite color coating galvanized sheet, which contains organic resin, organic acid, inorganic salt, oxidant, pH regulator and water. The characteristic is that the organic combination of water-based epoxy resin, organic acid, inorganic salt and oxidizing agent acts on the galvanized sheet to form a dense organic-inorganic composite passivation film, which is conducive to simplifying the galvanized sheet color coating process and reducing costs. An environmentally friendly chromium-free passivation solution overcomes the problem of using chromium-containing surface treatment solutions for color-coated plates. However, the passivation performance of this chromium-free passivation solution on other metal surfaces is unknown
CN103290401A discloses a self-lubricating chromium-free passivation solution and its preparation method. The plate product of the passivation solution has no pollution, low friction, anti-oxidation, anti-wear extreme pressure, corrosion resistance, fingerprint resistance and good mechanical properties, which can be It is used directly on the surface of galvanized sheets and parts of some mechanical equipment. However, the passivation solution provided by the invention contains polytetrafluoroethylene emulsion, and polytetrafluoroethylene will affect the subsequent coating performance of galvanized sheets. Make it difficult for the coating to bond firmly with the metal plate
CN103289569A discloses a self-lubricating passivation solution and a hot-dip galvanized self-lubricating coated steel plate coated with it, the passivation solution does not contain Cr 6+ and other substances harmful to the environment, with environmental protection, corrosion resistance, anti-wear extreme pressure, coating and self-lubricating properties. brought adverse effects

Method used

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  • Compound chromate-free passivator capable of forming films rapidly and preparation method
  • Compound chromate-free passivator capable of forming films rapidly and preparation method
  • Compound chromate-free passivator capable of forming films rapidly and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example provides three formulations of fast-film-forming composite chromium-free passivators and five comparative formulations, as shown in Table 1.

[0038] Table 1 formula concrete component and content (mass percentage, balance is water)

[0039]

Embodiment 2

[0041] The present embodiment provides the preparation method of the compound chromium-free passivating agent of rapid film formation, comprises the following steps:

[0042] (1) Weigh each component according to the proportion, first add part of water into the reaction kettle, then add water-based resin, surfactant, corrosion inhibitor and accelerator in sequence, and stir until the liquid becomes clear;

[0043] (2) Add a silane coupling agent to the solution in step (1), fully stir until the liquid becomes clear, and the stirring time is >2h;

[0044] (3) Add silicon dioxide to the liquid in step (2), and stir until the liquid turns into a clear colloid.

Embodiment 3

[0046]Adopt the preparation method that embodiment 2 provides and the prescription of embodiment 1, prepared the passivating agent of corresponding numbering, compared the metal material sample after these passivating agent processing and the sample (galvanized) without passivating agent processing Plate) corrosion resistance results, the number of the style corresponds to the number of the passivating agent formula, and the results are shown in Table 2. The technological process of metal surface treatment is: degreasing→water washing→water washing→passivation→water washing→drying→post-treatment, using dipping or spraying treatment, the mass concentration of passivation solution is 3-5%, and the pH value of the working solution is 5.0~7.5, the treatment temperature is 10~40℃, and the treatment time is 0.5~3min. Neutral salt spray test uses salt spray of neutral NaCl solution to accelerate corrosion, adopts the method of continuous spraying to carry out the test according to th...

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Abstract

The invention provides a compound chromate-free passivator capable of forming films rapidly. The compound chromate-free passivator comprises water-dilutable resin, silicon dioxide, a surfactant, a corrosion inhibitor, an accelerant and water. The chromate-free passivator provided by the invention does not contain poisonous and harmful ingredients such as heavy metal, sodium nitrite, phosphoric acid and the like, is environment-friendly, pollution-free and clean in production, and is close to passivation effect of hexavalent chromate in the aspect of comprehensive performance such as corrosionresistance and reprocessing; and the passivator sufficiently utilizes the diversity of organic high-molecular polymers and the rapid forming characteristic of inorganic salt, so that a high-performance resin and zirconium-based oxide layer compound coating can be provided for metal surfaces, compound passivation film provides a double protection function for protection of metal surfaces, and the organic coating has a clear advantage of delaying initial-stage corrosion on the metal surfaces, so as to ensure that the metal surfaces have excellent corrosion resistance and then the adhesive forceof coating is improved.

Description

technical field [0001] The invention belongs to the technical field of alloy passivation, and in particular relates to a fast film-forming composite chromium-free passivator and a preparation method. Background technique [0002] Metal materials react with their environment to cause corrosion of metal materials. Different metal materials have different corrosion mechanisms in different environments, and the corrosion conditions are also different. Therefore, there are various metal protection methods, such as alloying, Electrochemical protection, isolation method, etc. Tungsten, molybdenum, and chromium metal elements all belong to group VI. At present, molybdate has been widely used in the field of non-ferrous metal and steel surface passivation in industrial production. In addition, metal corrosion inhibitors often use tungstate, so many scholars at home and abroad Its application in chromium-free passivation has been studied. A large number of studies have shown that al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44C23C22/68C23C22/34
CPCC23C22/44C23C22/34C23C22/68C23C2222/20
Inventor 邓义为
Owner 长沙艾森设备维护技术有限公司
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