Surface pretreatment process for improving film forming quality of magnesium alloy conversion film
A surface pretreatment, magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of affecting the quality of film formation, unable to protect the magnesium substrate, and large surface damage, so as to improve the surface quality, improve the surface treatment effect, and improve the quality of the surface. The effect of film quality improvement
Pending Publication Date: 2021-12-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At room temperature, the surface of magnesium reacts with oxygen in the air to form a magnesium oxide film, but because the magnesium oxide film is loose and porous, its compactness coefficient is only 0.79, that is, the volume of magnesium oxide generated after magnesium oxidation shrinks, which cannot affect the magnesium substrate. play an effective protective role
The conversion coating on the surface of magnesium alloy is one of the main methods to solve the corrosion problem of magnesium alloy. However, the acid and alkali pretreatment will cause great damage to the surface and seriously affect the film quality. The surface state of the substrate is closely related to [3]
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0015] The surface pretreatment process is to grind and polish the magnesium alloy with 800, 1200, 2000# sandpaper, put it into anhydrous ethanol and ultrasonically clean it for 10 minutes, and use 5-15g / L NaOH+5g / L NaOH 2 CO 3 The solution is used as an alkaline washing solution for alkaline washing at 40-75°C for 5-15 minutes, using 5-15g / L NH 4 HF 2 +1~10g / L C 2 h 2 o 3 ·H 2 O was acid-washed at room temperature for 5-15 s, and finally activated with 10-30 wt.% NaOH at room temperature for 400-800 s.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
According to the experiment, the magnesium alloy surface is treated and compared under the condition that glyoxylic acid and ammonium bifluoride serve as pickling solutions and hydrochloric acid and hydrofluoric acid serve as pickling solutions. A large number of black spots can be found on the surface treated by hydrochloric acid and hydrofluoric acid, and the surface quality requirement of a sample in the film forming process cannot be met. Glyoxylic acid and ammonium bifluoride are used as the pickling solutions for treatment, so that corrosion pits on the surface of the sample and at the junction of a secondary phase and a matrix can be effectively reduced. Glyoxylic acid and ammonium bifluoride are adopted as the pickling solutions, so that a very good surface treatment effect can be achieved, and the surface quality is greatly improved. The film forming quality of the magnesium alloy conversion film is improved.
Description
technical field [0001] The invention relates to a surface pretreatment process for improving the film-forming quality of a magnesium alloy conversion film. Background technique [0002] Magnesium alloys have the advantages of light weight, high specific strength and specific stiffness, and good impact resistance and compression resistance. The density of magnesium is 1.74g / cm 3 , is 2 / 3 of aluminum, 1 / 4 of zinc, and 1 / 5 of steel, and is currently the lightest metal structure material. [1, 2]. With the increasingly serious environmental problems such as the greenhouse effect, people's demand for lightweight structural materials continues to rise, and my country is one of the countries with the most abundant magnesium resources in the world, with good development potential. Due to environmental factors and strategic deployment considerations, the development of the magnesium alloy industry is of great significance. However, magnesium alloys have poor corrosion resistance. ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): C23G1/12C23G1/22C23C22/78
CPCC23G1/12C23G1/22C23C22/78
Inventor 齐建涛孙文涛宫宁朱永强于得水冯孟胡爽飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
PatSnap Eureka turns technology decisions into work you can execute. Powered by our Innovation Knowledge Graph, it runs expert workflows across engineering, life sciences, materials and intellectual property. Get your review-ready output in minutes.
