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Surface treating agent for improving corrosion resistance of galvanized fastener

A surface treatment agent and corrosion-resistant technology, which is applied in the direction of metal material coating technology, can solve the problems that need to be further improved, and achieve the effects of promoting the formation of passivation film, improving corrosion resistance, film thickness and compactness

Inactive Publication Date: 2021-03-09
郑家法
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current trivalent chromium passivation effect needs to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A surface treatment agent for improving the corrosion resistance of galvanized fasteners, made of the following raw materials in percentage by weight: chromium chloride 10%, cerium nitrate 5%, sodium fluoride 3%, 30wt% hydrogen peroxide 15%, urea and 2% of tartaric acid in a mass ratio of 1:5, 5% of 85wt% phosphoric acid, 0.3% of sodium dodecylbenzenesulfonate, and the balance is water.

[0018] The preparation method of the above-mentioned surface treatment agent comprises the following steps: adding chromium chloride and cerium nitrate into water for miscibility, then adding sodium fluoride, urea and tartaric acid, stirring and dissolving the solution and standing for 1 hour; Sodium alkylbenzene sulfonate and hydrogen peroxide were stirred and dissolved, and left to stand for 30 minutes to obtain the product.

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PUM

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Abstract

The invention discloses a surface treating agent for improving corrosion resistance of a galvanized fastener. The surface treating agent is prepared from the following raw materials in percentage by weight: 5-20% of chromium chloride, 3-10% of cerium nitrate, 1.5-5% of sodium fluoride, 10-25% of hydrogen peroxide, 1-3% of a mixture of urea and tartaric acid in a mass ratio of 1: 3-10, 3-10% of phosphoric acid, 0.1-0.5% of sodium dodecyl benzene sulfonate and the balance of water. Compared with the prior art, the surface treating agent for improving the corrosion resistance of the galvanized fastener has the advantages that a compact and uniform passivating film can be generated on the surface of a galvanized layer, the white rust time of a neutral salt spray test is longer than 240 hours,and the corrosion resistance of the galvanized fastener is greatly improved.

Description

technical field [0001] The invention belongs to the field of metal surface treatment, in particular to a surface treatment agent for improving the corrosion resistance of galvanized fasteners. Background technique [0002] Fasteners are a type of mechanical parts that are used for fastening connections and are widely used. Fasteners are used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemicals, metallurgy, molds, hydraulics, etc., in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, All kinds of fasteners can be seen in chemical industry, instrumentation and supplies, etc., which are the most widely used mechanical basic parts. It is characterized by a wide variety of specifications, different performances and uses, and a high degree of standardization, serialization, and generalization. China is currently the world's largest producer of carbon steel fasteners su...

Claims

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Application Information

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IPC IPC(8): C23C22/36C25D5/48
CPCC23C22/36C23C2222/10C25D5/48
Inventor 郑家法
Owner 郑家法