Environmental Sealing Utilizing Vacuum Impregnation Technology
Vacuum impregnation sealing at Magna-Tech Manufacturing is most effective on porous substrates such as metal castings and powdered metal components required to meet pressure retention specifications, or to improve machinability or finish quality of the part. Candidates for impregnation include parts manufactured to contain gases or liquids and parts that will be plated or coated with a surface finish. Parts can be impregnated in the as-cast or in the machined state.
Porosity (micro-voids of trapped air) is common in nearly all metal castings and powdered metal applications. Over time, these micro-voids can lead to leak paths and, ultimately, to part failure.
Magna-Tech provides batch processing for parts requiring vacuum impregnation. Parts are submitted to a vacuum chamber where the air in the microscopic voids within the casting wall is evacuated. When the vacuum is released, the voids are filled with impregnation sealant (resin).
Some of our processes may incorporate pressure at the end of the cycle, driving the resin deeper into the part. After the vacuum impregnation cycle is complete, polymerization of the resin occurs either in the absence of air (anaerobic) or in the presence of heat (thermal cure). Regardless of the cure method, all resin on exterior surfaces will be removed in a series of aqueous washes.
The vacuum impregnation process fills and permanently seals the porosity networks of the part. Because of the impregnation process, surface applications like metal plating and painting are enhanced. Future blistering, out-gassing, and discoloration are eliminated with impregnation.
The use of vacuum impregnation adds up to financial savings for the metals caster and/or the end user by reducing labor costs in order to save parts that would otherwise be scrapped.
Some of the components currently being impregnated at Magna-Tech Manufacturing include:
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Magna Tech meets process requirements as defined in the specifications listed below:
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Vacuum impregnation sealing at Magna-Tech Manufacturing is most effective on porous substrates such as metal castings and powdered metal components required to meet pressure retention specifications, or to improve machinability or finish quality of the part. Candidates for impregnation include parts manufactured to contain gases or liquids and parts that will be plated or coated with a surface finish. Parts can be impregnated in the as-cast or in the machined state.
Vacuum impregnation sealing provided by the electronic components division of Magna Tech is effective for wire harnesses, terminated connectors, thermistors, over-molded coil windings, and insert and injection mold components that are exposed to harsh environmental conditions. The sealing process ensures part integrity. There is no change in the appearance or dimensional attributes of the components.
Magna-Tech Manufacturing offers processes to remove rust and corrosion from ferrous materials. Production parts that cannot be used, or may be considered scrap due to corrosion, are candidates for Magna-Tech’s de-rusting services.
Magna-Tech Manufacturing provides Thermal Deburring services for applications that typically have inaccessible burrs such as internal and external flashing burrs, rough edge finishes and applications that have threaded holes.
Magna-Tech Manufacturing offers Iridite Conversion Coating, also known as Chromate Conversion Coatings. Conversion Coating is conductive and is designed to improve corrosion resistance for unpainted aluminum surfaces as well as increase adhesion of paint finish for aluminum and aluminum alloys.
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During casting, at least some of the hardening atoms remain in solution. If the part is elevated in temperature, the rate of nucleation and growth of these precipitates can be accelerated. This treatment is called artificial aging (T5) and improves strength through precipitate hardening. Some T5 treatments are performed for the purposes of stabilization rather than improving strength.
Shipping containers often become contaminated from repeated use or from machining oils and other debris. Magna-Tech provides dunnage washing services to clean these contaminants from shipping materials. We utilize a fully automated system to provide fast and cost-effective service.