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It is found that the sample using mechanical mixing powder has no complete penetration layer after corrosion(low sodium white fused alumina), that is, while the sample using ball mill mixing powder has small etch pits and not much distribution. The surface of the sample with rare earth added is relatively small(brown fused alumina for sale). It is generally believed that rare earths can improve the corrosion resistance of the layer The mechanism is multifaceted.

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Using SEM to observe the surface morphology of the infiltrated layer under different magnifications after uniform corrosion of the ball-milled mixed sample(aluminum oxide blast media 60 grit), the surface of the infiltrated layer appeared massive exfoliation, and the corrosion pits can be seen after magnification. Reduce the total amount of inclusions in the permeable layer(brown fused alumina grit), reduce the source of pitting corrosion, thereby improving its pitting corrosion resistance.

(low price aluminium oxide suppliers austria)In summary, the test results show that during the polarization process of the rare earth sample(120 grit aluminum oxide), there is an inflection point where the current suddenly increases that other samples do not have, indicating that there is a passivation film on the surface under natural corrosion, which is self-passivation(silicon carbide abrasive powder). The passivation current of the permeation layer is small and relatively stable, indicating that the surface passivation film is very dense.

However, although there is a passivation film(150 grit aluminum oxide), the passivation current increases with the increase of the polarization potential, and the passivation area is also narrow. The other samples did not show passivation, which shows that the pitting corrosion resistance of the samples with rare earth is better than other boron-aluminized layers in terms of electrochemical corrosion resistance(pink aluminium oxide). Smooth with very few pits.(low price aluminium oxide suppliers austria)

From the above analysis, it can be concluded that the degree of corrosion resistance of the permeating layer is different in different preparation processes of the permeating agent(brown fused aluminum oxide manufacturers), and the order of superiority to inferiority is: ball milling, mechanical mixing, and original sample(brown fused alumina). It can be seen from the above test results that the addition of rare earth can effectively improve the corrosion resistance of the infiltration layer.

(low price aluminium oxide suppliers austria)Regarding the issue of improving the corrosion resistance of the boron-aluminized layer by rare earths(alumina grit), certain studies have been carried out at home and abroad, but the results of the research are far from enough, the passivation current density of the sample is very small, and large etch pits can be seen with the naked eye(220 grit aluminum oxide blast media), it is relatively weak, and the mechanism has not been fully understood, and reduces corrosion.

Observing the uniform corrosion morphology of the sample surface(100 grit aluminum oxide media), which reduces the activation point, indicating that the addition of rare earths to the permeating agent can significantly reduce the active dissolution rate of the permeating layer. The fine and uniform distribution of carbides in the co-carburized layer will inhibit the formation of sulfides with poor corrosion resistance(black silicon carbide powder), which can play a role in purifying the raw material.

The corrosion current of the sample after infiltration is smaller than that of the original sample(80 grit aluminum oxide), which indicates that the boron-aluminum co-infiltration can obtain effective surface strengthening, rare earth ball milling, significantly reduce the amount of wear and improve the wear resistance(green silicon carbide powder). The test results show that the infiltration of the material surface can significantly improve the wear resistance of the matrix.(low price aluminium oxide suppliers austria)

The infiltrated B, Al, Ce combine with the elements on the surface to form new phases such as FeB, FeaB, Ce2O3, makes the layer structure uniform and refined(white fused alumina abrasives). Rare earth will react with hydrogen to generate rare earth hydride, thereby controlling part of the hydrogen in the raw material(carborundum grit suppliers). In addition, rare earths also preferentially react with impurity elements such as S and P to form stable compounds.