ASTM B614-16 (R2021) pdf free download.Standard Practice for Descaling and Cleaning Zirconium and Zirconium Alloy Surfaces.
1.1 This practice covers a cleaning and descaling procedure useful to producers, users, and fabricators of zirconium and zirconium alloys for the removal of ordinary shop soils, oxides, and scales resulting from heat treatment operations and foreign substances present as surface contaminants.
1.2 It is not intended that these procedures become mandatory for removal of any of the indicated soils hut rather serve as a guide when zirconium and zirconium alloys are being processed in the wrought, cast, or fabricated form.
1.3 It is the intent that these soils be removed prior to chemical milling, joining, plating, welding, fabrication, and in any situation where foreign substances interfere with the corrosion resistance, stability, and quality of the finished product.
1.4 Unless a single unit is used, for example, solution concentrations in gil, the values stated in either inch-pound or SI units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must he used independently of the other. SI values cannot he mixed with inch-pound values.
1.5 This standard does not purport to address all of the saferc concerns, if associated with its use. It is the responsibthtv of the user of this standard to establish appropriate safet health, and environmental practices and determine the apphcabilitv of regulatory Inn itations prior to use. For specific hazard statements, see Sections 3 and 7.
3. Processing Soil Removal
3.1 Grease, oil, and lubricants employed in machining, forming, and fabricating operations on zirconium and zirconium alloys should be removed by employing one of the methods or a combination of methods as listed: (1) alkaline or emulsion soak-type cleaners, (2) ultrasonic cleaning, (3) acetone, citrus based cleaners, or safety solvent immersion washing or vapor degreasing, or (4) electrolytic alkaline cleaning system. In the electrolytic system, the work can be either anodic or cathodic polarity provided voltage and current density are controlled to avoid anodizing. Removal of these soils is recommended prior to heat treatment or application of acid treatment designated in Section 5. When electrolytic systems are employed, the voltage should be controlled to prevent the occurrence of spark discharge and subsequent pitting. The use of trichloroethylene is not prohibited and can be used; however its use is hazardous enough to preclude it as a recommended solvent in this standard. Care must be exercised when using chemical solvents. There are hazards associated with their use, such as Aammability, carcinogenicity, and ozone depletion (see 7.1).
4. Blast Cleaning
4. 1 Mechanical descaling methods such as sandblasting, shot blasting, and vapor blasting may be used to remove hot rork scales and lubricants from zirconium surfaces if followed by thorough conditioning and cleaning as described in Section
4.2 Aluminum oxide, silicon carbide, silica sand, zircon sand, and steel grit are acceptable media for mechanical descaling. Periodic replacement of used media may be required to avoid excessive working of the metal surface by dull particulate.ASTM B614 pdf download.