Al-free medical zinc-based alloy dendrite corrosion reagent and preparation method and use method thereof

Abstract

The invention provides an Al-free medical zinc-based alloy dendrite corrosion reagent, and a preparation method and a use method thereof, and relates to the technical field of metallographic analysis of as-cast zinc alloys. The Al-free medical zinc alloy dendrite corrosion reagent is prepared from 3.5-4.5 g of citric acid, 2-3 ml of glacial acetic acid, 4.4-5 g of picric acid, 40-45 ml of ethanol and 50-60 ml of deionized water. Before corrosion, a sample is ground by 1000 #, 2000 #, 3000 # and 5000 # abrasive paper in sequence, and then chemical polishing is carried out by using a nitric acid methanol solution with a specific proportion. The corrosion reagent is dropped on the surface of a zinc alloy in an inclined mode, and when the corrosion agent on the surface of the alloy is turned into reddish brown from light yellow, the zinc alloy is immediately immersed in an ethanol / hydrochloric acid mixed solution for ultrasonic cleaning and air-dried by cold air for later use. A polarized light microscope is adopted to inspect the refined dendritic structure of the alloy. The Al-free medical zinc alloy dendrite corrosion reagent has the advantages of good stability and simple formula, can obtain high-quality contrast in the specific use process, and can finish effective distinguishing of refined dendritic structures and microstructures.

Description

technical field [0001] The invention belongs to the technical field of metallographic analysis of cast zinc alloys, and in particular relates to a dendrite corrosion reagent for Al-free medical zinc-based alloys, a preparation method and a use method thereof. Background technique [0002] When traditional medical metal materials serve in the physiological environment of the human body, they not only need to bear the cyclic alternating load and the synergistic enhanced damage of multiple corrosion factors, but also suffer from the dynamic flow erosion / abrasion damage of the body fluid environment, which can easily cause the loss of medical metal materials to accelerate. and the service period are sharply reduced; in addition, the release of toxic ions caused by the interaction of wear and corrosion, such as Ni 3+ 、Al 3+ And so on, it can also lead to organ lesions. [0003] With the emergence of a new generation of medical degradable metal implants, it has brought many poss...

AI Technical Summary

Problems solved by technology

However, the above-mentioned corrosive agents cannot accurately display the fine structure of Al-free medical zinc alloys, especially the emergence of new medical zinc alloys containing rare earths, tin, copper and calcium, which brings difficulties in the in-depth analysis of their microstructures.

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