Method for forming high-corrosion-resistant nickel and chromium composite coating on steel surface
A composite coating, high corrosion resistance technology, applied in coatings, electrolytic coatings, etc., can solve problems such as hindering sustainable development, endangering people's health, destroying ecological balance, etc., achieving low cost, excellent corrosion resistance, and good dispersion. Effect
Active Publication Date: 2014-10-22
HARBIN ENG UNIV
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Problems solved by technology
[0002] Corrosion is the main failure mode of materials. A large part of energy waste and economic loss comes from corrosion. According to relevant research, rust and other corrosion consume about one tenth of the world's steel production, and corrosion causes considerable Severe environmental pollution, destroying ecological balance, endangering people's health, hindering sustainable development
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Embodiment 1
[0022] Cut the Q235 steel wire into a sample with a length of 50 mm, a width of 20 mm and a thickness of 5 mm;
[0023] Soak in acetone for ultrasonic treatment to remove the residual oil stain when cutting the sample. Ultrasonic treatment time 3h;
[0024] Grind the sample with 150#, 400#, 800# sandpaper in turn, put it in acetone ultrasonic cleaning for 2 hours, then use alkaline lotion to remove oil for 2 hours, and finally wipe the Q235 steel with absolute ethanol, dry it with a hair dryer, and place it in 60 Store in an oven at ℃;
[0025] Plating solution configuration: use a balance to weigh 220-250g of nickel sulfate, 20-40g of nickel chloride, and 20-40g of boric acid. After adding deionized water to one liter, use a balance to weigh 0.2-0.3g of 1,4-butynediol , gum arabic 0.4g, and phytic acid 0.2g were added to the above solution, stirred thoroughly for 24 hours, and finally weighed 20g of nano-chromium powder (about 60nm) and put it in a small amount of electropla...
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The invention provides a method for forming a high-corrosion-resistant nickel and chromium composite coating on a steel surface. The method comprises the following steps: electroplating a steel material subjected to surface pretreatment in plating liquid, and post-treating, wherein each liter of the plating liquid contains 220g-250g of nickel sulfate, 20g-40g of nickel chloride, 20g-40g of boric acid, 0.2g-0.3g of 1,4-butynediol, 0.4g of Arabic gum, 0.2g of phytic acid and 20g of nano Cr powder; the average current density is 2.0-3.0A.dm<-2>, the pulse frequency is 250-800Hz, the duty ratio is 30%-50%, the temperature of the plating liquid is 30-50 DEG C, and the stirring speed is controlled to be 3-5r / s. Compared with a conventional electroplating process, the method has the characteristics that Cr is well dispersed in the plating liquid in a form of nano Cr particles, the Cr particles and nickel are plated on the surface of metal to be plated under the action of pulse current, the obtained coating is high in thickness and excellent in corrosion resistance, and Cr is good in dispersity.
Description
technical field [0001] The invention relates to a steel protective treatment method, in particular to a method for forming a protective layer on the steel surface. Background technique [0002] Corrosion is the main failure mode of materials. A large part of energy waste and economic loss comes from corrosion. According to relevant research, rust and other corrosion consume about one tenth of the world's steel production, and corrosion causes considerable Severe environmental pollution destroys ecological balance, endangers people's health and hinders sustainable development. Therefore, the use of effective protective measures is an effective way to reduce corrosion and wear losses. [0003] Composite electroplating technology is one of the effective means of protection. It can effectively play the role of corrosion resistance, wear resistance, oxidation resistance and decoration. Because of its low cost, it is convenient for large-scale production. Therefore, it has been ...
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Login to View More IPC IPC(8): C25D15/00C25D5/18C25D3/14
Inventor 孟国哲崔媛邵亚薇张涛王艳秋刘斌
Owner HARBIN ENG UNIV