Preparation method of corrosion-resistant self-healing coating on magnesium alloy surface based on phosphate
A self-healing, magnesium alloy technology, applied in the direction of surface reaction electrolytic coating, metal material coating process, coating, etc., can solve the problems of limited corrosion protection and poor corrosion resistance, and achieve low equipment requirements, thickness and The effect of uniform structure and simple preparation
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0025] The preparation method of a self-healing coating provided by the present invention, such as Figure 1 to 2 As shown, the electrolytic solution is used to prepare an oxide layer on the surface of the magnesium alloy by micro-arc oxidation, and then the self-healing layer is prepared in an acidic solution containing phosphate and corrosion inhibitor. Compared with the prior art, the self-healing layer provided by the present invention has a better protective effect in a corrosive environment, and has the following advantages as a workpiece: (a) a denser film and lower porosity; (b) ) Corrosion inhibitors are loaded in the film. When corrosion occurs, the corrosion inhibitors can gather in the corroded area in time. The self-repairing method is sensitive and the repair is started in time; (c) It can realize multiple repairs in one area and multiple areas at the same time. The repair method is sensitive, and the repair is started in time; (d) the thickness and structure of t...
Embodiment 1
[0036] In this example, it is made by using electrolyte on the surface of magnesium alloy through micro-arc oxidation and depositing in acidic solution containing phosphate and corrosion inhibitor. Follow the steps below to implement:
[0037] Step 1: Choose AM50 magnesium alloy as the matrix material, configure the micro-arc oxidation growth electrolyte composition: sodium silicate 20g / L, potassium fluoride 4g / L, sodium hydroxide to adjust the pH to 12;
[0038] Step 2: Use the metal substrate to grow the oxide film as the anode, and the graphite plate as the cathode, and adjust the distance between the anode and the cathode to 200mm;
[0039] Step 3: Select the constant current mode, the current density is 2A / dm 2 , Regulate pulse frequency to 300Hz, pulse duty cycle to 30%;
[0040] Step 4: Configure the acidic phosphate solution. The ingredients are: sodium dihydrogen phosphate 60g / L, barbituric acid 0.01mol / L, phosphoric acid adjust the pH to 4, and the metal with the micro-arc o...
Embodiment 2
[0042] In this example, it is made by using electrolyte on the surface of magnesium alloy through micro-arc oxidation and depositing in acidic solution containing phosphate and corrosion inhibitor. Follow the steps below to implement:
[0043] Step 1: Choose AM50 magnesium alloy as the matrix material, configure the micro-arc oxidation growth electrolyte composition: sodium silicate 20g / L, potassium fluoride 4g / L, and sodium hydroxide to adjust the pH to 12;
[0044] Step 2: Use the metal substrate to grow the oxide film as the anode, and the graphite plate as the cathode, and adjust the distance between the anode and the cathode to 200mm;
[0045] Step 3: Select the constant voltage mode, the voltage value is 450V, the control pulse frequency is 300Hz, and the pulse duty ratio is 30%;
[0046] Step 4: Configure the ingredients of the acidic phosphate solution: sodium dihydrogen phosphate 60g / L, sodium lauryl sulfate 0.01mol / L, phosphoric acid adjust the pH value to 4, soak the metal ...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More