Surface-treated metal material having excellent scale adhesion-suppressing properties, method for producing same, heat exchanger, and seawater evaporator
A surface treatment and metal material technology, applied in metal material coating process, seawater treatment, heat exchange equipment, etc., can solve the problems of reduced maintenance frequency, reduced thermal conductivity of metal materials, unable to inhibit scale adhesion, etc., to reduce maintenance. Frequency, the effect of scale adhesion suppression
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0035] (for the production of experimental pieces)
[0036] As the titanium base material, a plate (thickness: 0.5 mm) composed of industrial pure titanium class 2 (JIS H4600) was used, and the plate was cut into 10 mm×50 mm, washed with acetone, and air-dried at room temperature. The titanium plate was immersed in a mixed acid aqueous solution (2%HF-10%HNO3) composed of hydrofluoric acid and nitric acid at room temperature 3 ) after 15 seconds, wash with ion-exchanged water, and polyphosphate (sodium polyphosphate: Na n+2 P n o 3n+1 ) and metal salt (chloride) in a mixed aqueous solution (surface treatment solution) for 3 minutes or 3 to 12 hours, then rinsed with ion-exchanged water, and air-dried at room temperature.
[0037] (Determination of surface element concentration)
[0038] The concentration of each element in the modified layer was measured by glow discharge spectroscopy (GD-OES method). The test pieces were cut into about 10 mm squares and embedded in indium...
Embodiment 2
[0054] (for the production of experimental pieces)
[0055] A plate (thickness: 0.5 mm) made of SUS304 (JIS G4304) was used as the stainless steel base material, which was cut into 10 mm×50 mm, washed with acetone, and air-dried at room temperature. The stainless steel plate was washed with ion-exchanged water, and polyphosphate (sodium polyphosphate: Na n +2 P n o 3n+1 ) and metal salt (chloride) in a mixed aqueous solution (surface treatment solution) for 3 minutes or 3 to 12 hours, then rinsed with ion-exchanged water, and air-dried at room temperature.
[0056] The surface-treated stainless steel material was subjected to measurement of surface element concentration and scale adhesion evaluation in the same manner as in Example 1.
[0057] The results after these implementations are shown in Table 2 (Experiment Nos. 12 to 22) below together with the types of surface treatment liquids.
[0058] 【Table 2】
[0059]
[0060] From this result, the following can be cons...
Embodiment 3
[0068] (for the production of experimental pieces)
[0069] As the titanium base material, a plate (thickness: 0.5 mm) composed of industrial pure titanium Class 2 (JIS H4600) was used, which was cut into 10 mm×50 mm, washed with acetone, and air-dried at room temperature. The titanium plate was immersed in a mixed acid aqueous solution (2% HF-10% HNO 3 ) at room temperature for 15 seconds, washed with ion-exchanged water, polyphosphate (sodium polyphosphate: Na n+2 P n o 3n+1 ) and metal salts (chlorides) with water or hydrofluoric acid and nitric acid (0.1% HF-0.5% HNO 3 ) is immersed in the surface treatment solution of the solvent for 12 hours, then rinsed with ion-exchanged water, and air-dried at room temperature.
[0070] For the surface-treated titanium material, the measurement of the surface element concentration and the scale adhesion evaluation were carried out by the following methods.
[0071] (Determination of surface element concentration)
[0072] The su...
PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| Adhesion amount | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More