Metal post-plating chromium-free passivator with hydrophobic surface property

Abstract

The invention discloses a metal post-plating chromium-free passivator with hydrophobic surface property. The passivator comprises the following raw materials: 0.5-30 g / L of silicate, 0.01-1 g / L of a nanometer material and 0.1-10 g / L of one or more of a silane coupling agent, a titanate coupling agent and a water-based wax emulsion. Through adoption of the passivator, a passive film is formed on the surface of plated metal to achieve an anti-corrosion purpose; the metal surface plating treated by the passivator is good in hydrophobic function and hydrophobic function, can achieve a lotus-leaf-like effect, has a self-cleaning function, is low in possibility of dust gathering, and can be cleaned by water very easily; moreover, the passivator is environment-friendly, simple to prepare, convenient to use, and wide in application prospect; the raw materials are wide in source and low in cost.

Description

technical field

[0001] The invention relates to a protective agent after plating on metal surfaces and a using method thereof, in particular to a chromium-free passivating agent after metal plating with hydrophobic surface performance. Background technique

[0002] After metal plating, it is usually passivated to improve its corrosion resistance. The traditional passivation treatment method usually uses the oxidation of hexavalent or trivalent chromium ions to form a dense oxide film on the surface of the coating, that is, the passivation film, which can prevent the metal from contacting with corrosive media such as water and oxygen in the air. So as to achieve the role of anti-corrosion. Because chromium ions are extremely harmful to the environment and the human body, their use is limited. In January 2003, with the passage of the ROHS Directive, which prohibits the use of chromate-passivated galvanized steel sheets in electronic and electrical products exported to the EU...

Examples

Embodiment 1

[0023] Use deionized water to prepare a passivator with a sodium silicate concentration of 0.5g / L, a methyltrimethoxysilane coupling agent concentration of 0.1-0.5g / L, and a nano-titanium dioxide concentration of 0.2g / L, and adjust the pH to 12 , to obtain passivator 1.

Embodiment 2

[0025] Use deionized water to prepare sodium silicate with a concentration of 5g / L, the concentration of methyltrimethoxysilane coupling agent and alcohol amine titanate coupling agent with a concentration of 0.8-1.2g / L, and the concentration of silicone defoamer with a concentration of 2g / L. L, the passivating agent whose concentration of nano-titanium dioxide and nano-silicon dioxide is 0.01g / L, the pH is adjusted to be 10, and the passivating agent 2 is obtained.

Embodiment 3

[0027] Use deionized water to prepare lithium silicate with a concentration of 15g / L, γ-aminopropyltriethoxysilane coupling agent and alcoholamine titanate coupling agent with a concentration of 2-5g / L, and a nano-silica concentration of 0.5g / L, organic silicon defoamer and C7-9 alcohol polyoxyethylene ether penetrating agent concentration of 3g / L passivating agent, adjust pH to 10, to obtain passivating agent 3.

technical field

[0001] The invention relates to a protective agent after plating on metal surfaces and a using method thereof, in particular to a chromium-free passivating agent after metal plating with hydrophobic surface performance. Background technique

[0002] After metal plating, it is usually passivated to improve its corrosion resistance. The traditional passivation treatment method usually uses the oxidation of hexavalent or trivalent chromium ions to form a dense oxide film on the surface of the coating, that is, the passivation film, which can prevent the metal from contacting with corrosive media such as water and oxygen in the air. So as to achieve the role of anti-corrosion. Because chromium ions are extremely harmful to the environment and the human body, their use is limited. In January 2003, with the passage of the ROHS Directive, which prohibits the use of chromate-passivated galvanized steel sheets in electronic and electrical products exported to the EU...

Examples

Embodiment 1

[0023] Use deionized water to prepare a passivator with a sodium silicate concentration of 0.5g / L, a methyltrimethoxysilane coupling agent concentration of 0.1-0.5g / L, and a nano-titanium dioxide concentration of 0.2g / L, and adjust the pH to 12 , to obtain passivator 1.

Embodiment 2

[0025] Use deionized water to prepare sodium silicate with a concentration of 5g / L, the concentration of methyltrimethoxysilane coupling agent and alcohol amine titanate coupling agent with a concentration of 0.8-1.2g / L, and the concentration of silicone defoamer with a concentration of 2g / L. L, the passivating agent whose concentration of nano-titanium dioxide and nano-silicon dioxide is 0.01g / L, the pH is adjusted to be 10, and the passivating agent 2 is obtained.

Embodiment 3

[0027] Use deionized water to prepare lithium silicate with a concentration of 15g / L, γ-aminopropyltriethoxysilane coupling agent and alcoholamine titanate coupling agent with a concentration of 2-5g / L, and a nano-silica concentration of 0.5g / L, organic silicon defoamer and C7-9 alcohol polyoxyethylene ether penetrating agent concentration of 3g / L passivating agent, adjust pH to 10, to obtain passivating agent 3.

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