Aluminium alloy chromium-phosphorus-free nanoscale chemical conversion liquid for ships and method for preparing conversion film

A chemical conversion coating and chemical conversion technology, applied in the field of marine aluminum alloy decoration and protective coating, can solve problems such as environmental pollution, and achieve the effect of good corrosion resistance and good organic coating adhesion

Inactive Publication Date: 2012-04-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide a new type of chromium-free and phosphorus-free nano-scale chemical conversion liquid for marine aluminum alloys and its application in chemical conversion coatings, to solve the problems of environmen

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  • Aluminium alloy chromium-phosphorus-free nanoscale chemical conversion liquid for ships and method for preparing conversion film
  • Aluminium alloy chromium-phosphorus-free nanoscale chemical conversion liquid for ships and method for preparing conversion film
  • Aluminium alloy chromium-phosphorus-free nanoscale chemical conversion liquid for ships and method for preparing conversion film

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[0027] Hereinafter, the present invention will be described in detail through the drawings and embodiments, but is not limited.

[0028] The chromium-free and phosphorus-free nano-level chemical conversion solution for marine aluminum alloy of the present invention includes titanium salt, zirconium salt, silicon compound, accelerator, pH adjuster, surfactant, etc. The conversion solution is titanium salt, zirconium salt, silicon compound, Accelerator, pH adjuster, and surfactant are uniformly mixed. The chromium-free and phosphorus-free nano-level chemical conversion liquid for marine aluminum alloy of the present invention is used to form a chromium- and phosphorus-free chemical conversion film. The film-forming process steps of the chromium- and phosphorus-free nano-level chemical conversion film are: degreasing→water washing→acid etching→water washing→ Chemical transformation→water washing→drying.

[0029] After the aluminum alloy is degreased, washed with water, acid-etched, a...

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Abstract

The invention relates to the field of an aluminium alloy decoration and protection coating for ships, and in particular relates to a novel aluminum alloy chromium-phosphorus-free nanoscale chemical conversion liquid for ships and an application of the chemical conversion liquid in a chemical conversion film. The chromium-phosphorus-free nanoscale chemical conversion liquid is prepared from a titanium salt, a zirconium salt, a silicon compound, an accelerator, a pH modifier, a surfactant and the like. The film-forming process of the chromium-phosphorus-free nanoscale chemical conversion film successively comprises the following steps of degreasing, washing, acidic etching, washing, chemical conversion, washing and drying. The chromium-phosphorus-free chemical conversion film is prepared from nanoscale titanium oxide, zirconium oxide, alumina and other composite oxides, has excellent corrosion resistance and organic coating adhesion, and can be used as an aluminum alloy surface decoration and protection coating for ships. The chemical conversion film prepared from the chemical conversion liquid in the invention does not contain chromium and phosphorus elements, has excellent corrosion resistance and organic coating adhesion, is simple in construction and convenient in maintenance, and is applicable to construction of large-area aluminum alloy sections.

Description

technical field [0001] The invention relates to the field of decorative and protective coatings for marine aluminum alloys, in particular to a novel chromium-free and phosphorus-free nanoscale chemical conversion liquid for marine aluminum alloys and its application in chemical conversion coatings (that is, the preparation method of the chemical conversion coatings). The chemical conversion film obtained by the invention does not contain chromium and phosphorus elements, has excellent corrosion resistance and organic coating adhesion, simple construction and convenient maintenance, and can be used for the construction of large-area aluminum alloy profiles. Background technique [0002] 5xxx and 6xxx aluminum alloys are widely used in ship structural materials due to their good corrosion resistance, weldability and mechanical properties. However, due to the thin oxide film of aluminum alloy itself, the substrate will be corroded by the erosion of seawater and humid and hot oc...

Claims

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Application Information

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IPC IPC(8): C23C22/06
Inventor 管勇刘斌张君男严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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