Technologie moření povrchových úprav odlitků ze slitin titanu

Titanová slitina:

  Titanium alloy is an alloy composed of other elements based on titanium element. Titanium has two kinds of isomorphic crystals: Titanium is an allotrope with a melting point of 1668 degree and a close-packed hexagonal lattice structure below 882 degree , which is called -titanium; it is body-centered cubic above 882 degree . The character structure is called -titanium. Using the different characteristics of the above two structures of titanium, adding appropriate alloying elements to gradually change the phase transformation temperature and component content to obtain titanium alloys with different structures.

Technologie moření povrchové úpravy odlitků z titanové slitiny:

　　1. Raw materials and process equipment

　　The materials for pickling are as follows:

　　 Process equipment:

　　The pickling tank can be welded by stainless steel, lined with hard polyvinyl chloride plastic board or directly use hard polyvinyl chloride plastic tank.

　　The pickling tank should be equipped with a cooling device, and the pickling tank with temperature requirements should be equipped with a temperature indicator.

　　In order to prevent the pickling liquid from volatilizing, the pickling tank should be covered and installed with a ventilation exhaust system.

　　The hangers, hanging baskets and fixtures used are made of titanium alloy materials or stainless steel with protective coatings or welded with hard polyvinyl chloride plastic plates.

　　 2. Process flow and requirements

　　 The following casting pickling process can be used: sandblasting to remove oxide scale → organic solvent cleaning → cold water washing → pickling → cold water washing → flowing cold water washing → spraying → drying → quality inspection.

　　 3. Pickling ingredients

　　 For titanium alloy castings, generally use ingredient 1 pickling solution. For some corrosion-resistant titanium alloys, a component with a higher corrosion rate can also be used. Pickling solution.

　　 4. Pickling operation

　　 When pickling, the casting should be moved up and down or swing so that the acid and the casting are in relative motion; the temperature of the acid should be monitored to prevent over-temperature.

　　According to the thinning amount of pickling to determine the pickling time. When pickling is started, take it out within 1min5min, and measure the thickness after washing with water to control the pickling time. The mass loss method can also be used to determine the corrosion rate to determine the pickling time.

　　 Use clean and oil-free dry compressed air to dry, or dry in an oven. Wear clean gloves to remove the casting, and protect the casting with clean packaging materials.

　　5. Requirement of pickling solution composition

　　 When preparing the solution, add the chemicals according to the proportion, and stir it evenly after the preparation is completed. The depth of the bath is generally not more than two-thirds of the depth of the bath.

　　 The concentration of titanium ions in the acid solution should be analyzed on a regular basis, and the interval is generally not more than 4 weeks. The analysis method can be analyzed by inductively coupled plasma atomic emission spectrometer.