How to make fiber streamline test for forging parts?
With 1:1 hydrochloric acid water heating, not necessarily boil, about 75 degrees can be, in acid solution for 25-20 minutes. Then take out and rinse with alcohol. Use a magnifying glass that is no more than 100 times larger. Only the streamline of the forging is clear, the direction of the inclusion in the forging process of the metal is the direction of the streamline
Acid corrosion prevention method: A. neutralization: soak in 10% ammonia solution and rinse with hot water. B. passivation method: immerse concentrated nitric acid for 5 seconds, then rinse with hot water. C. coating protection: coated with varnish and plastic film.
