Method for improving liquid metal corrosion resistance of heat-resistant steel
A liquid metal and heat-resistant steel technology, applied in metal material coating process, solid diffusion coating, coating and other directions, can solve the problems of difficult oxide film coating, large difference in thermal expansion coefficient, etc., to improve the resistance to liquid metal Corrosion performance, improved bonding force, and the effect of prolonging service life
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Embodiment 1
[0029] In this embodiment, the method for improving the corrosion resistance of heat-resistant steel to liquid metal is as follows:
[0030] (1) Pretreatment of the metal surface: Polish the metal sample with a size of 15mm×10mm×2mm to 2000# step by step with metallographic sandpaper, and round all the edges and corners, and then use a particle size of W2.5 Polished with water-soluble diamond paste, cleaned by acetone and alcohol, ultrasonically cleaned in deionized water, and dried.
[0031] (2) Formation of a continuous and dense oxide film: put the dried metal sample into a crucible, carry out high-temperature oxidation in an air furnace at 700°C for 50 hours, and then take it out.
[0032] The above-mentioned metal material is 9-12% Cr heat-resistant steel, and its specific chemical composition is: C: 0.18wt.%, Si: 1.21wt.%, Cr: 10.57wt.%, Mn: 0.42wt.%, W: 1.29wt. .%, Ta: 0.14wt.%, V: 0.20wt.%, Nb: 0.001wt.%, and the balance is iron.
[0033] Such as figure 1 with fig...
Embodiment 2
[0035] In this embodiment, the chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.25wt.%, Si: 1.43wt.%, Cr: 10.85wt.%, Mn: 0.54wt.%, W : 1.21wt.%, Ta: 0.11wt.%, V: 0.19wt.%, and the balance is iron. The other surface treatment process of the metal is the same as that of Example 1, but the high temperature oxidation temperature is 800° C., and the oxidation time is 300 h. There is a 70 μm thick decarburization layer between the oxide film and the substrate, see image 3 .
Embodiment 3
[0037]In this embodiment, the chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.085wt.%, Si: 0.26wt.%, Cr: 8.60wt.%, Mn: 0.46wt.%, W : 0.04wt.%, Ta: 0.01wt.%, V: 0.20wt.%, Nb: 0.04wt.%, and the balance is iron. The surface treatment process of this metal is the same as that of Example 1, but the high temperature oxidation temperature is 550° C., and the oxidation time is 100 h.
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