🪶 MAGNESIUM
Magnesium Machining for Aerospace in Hartford, CT
Magnesium is sourced in Hartford for one overriding reason, weight, since it is the lightest structural metal and finds use in aerospace gearbox housings, accessory cases, and components where shaving mass off a rotating engine assembly pays dividends. The catch is that magnesium machining demands fire-safe handling and specialized expertise, so the sourcing decision is as much about a shop's safety discipline as its machining skill.
AS9100NADCAPITAR
Magnesium is roughly two-thirds the density of aluminum and a fraction of the weight of steel or titanium, which makes it attractive precisely where mass is the enemy. In Hartford's aerospace base, that means engine gearbox and accessory housings, transmission cases, and structural components where every ounce removed from the engine improves performance and fuel burn. The material's good damping capacity also helps in housings that contain gears and vibration.
Common forms split between cast and wrought. Cast magnesium alloys like AZ91 and the rare-earth-containing ZE41A and EZ33A serve housings and cases, with the rare-earth alloys offering better elevated-temperature properties for hotter engine zones. Wrought alloys such as AZ31B appear in sheet and extruded forms for lighter structural parts.
The demand is genuine but specialized, and it comes with strings attached. Magnesium parts almost always need corrosion protection because the metal is reactive, and many are machined from castings, so the sourcing conversation usually involves both a foundry path and a machining path, plus the finishing that follows. A buyer should expect a more involved supply chain than for a simple aluminum part.
The fire-safety reality that defines magnesium sourcing
Magnesium's defining machining hazard is that its fine chips and dust are flammable and, once ignited, burn at extreme temperatures that water cannot extinguish, water actually feeds a magnesium fire. This is not a theoretical concern; it dictates how a qualified shop machines the material. Sharp tools and proper feeds to produce thick chips rather than fine powder, controlled coolant strategy (often dry or with specific non-aqueous coolants depending on the operation), meticulous chip housekeeping, and Class D fire suppression on hand are all part of safe magnesium machining.
The practical consequence for a buyer is that the pool of shops genuinely qualified to machine magnesium is far smaller than for aluminum, and you should verify the shop's magnesium experience and safety procedures directly. A shop that machines magnesium routinely will speak confidently about chip control, fire prevention, and housekeeping; a shop that treats it casually is a hazard to your parts and itself.
Do not assume a capable aluminum shop can simply switch to magnesium. The metallurgy and machining are different, and the safety requirements are categorically more demanding. Ask specifically whether the shop has dedicated magnesium experience, what fire-safety measures it has in place, and whether it has Class D suppression and proper chip handling.
Corrosion protection, documentation, and finishing
Magnesium is chemically reactive and corrodes readily, especially in the presence of moisture and dissimilar metals, so corrosion protection is not optional, it is integral to the part. Standard protection involves chemical conversion coatings (chromate or chrome-free equivalents) followed often by primer and paint, and careful design to avoid galvanic coupling with steel or aluminum fasteners. Confirm your supplier has a vetted path for the conversion coating your spec requires, ideally NADCAP-accredited for the special process.
Documentation follows aerospace norms: a material certification tying the alloy and chemistry to the heat or casting lot, a certificate of conformance to your drawing, and for first articles an AS9102 inspection report. For cast magnesium parts, NDT such as X-ray or penetrant inspection may be required to verify the casting is free of internal defects, and you should receive those records. Because magnesium parts are typically aerospace and often defense-related, ITAR compliance frequently applies, verify registration before transmitting controlled data.
The pitfall buyers must avoid is underestimating the finishing and protection burden. A bare machined magnesium part will corrode, and a part assembled against steel without galvanic isolation will corrode at the interface. Build the conversion coating, galvanic isolation, and any required NDT into both the spec and the schedule from the start.
Frequently Asked Questions
Magnesium is flammable in finely divided form, its fine chips, dust, and grinding fines can ignite, and once burning, magnesium reaches extreme temperatures and reacts violently with water, so a conventional water-based extinguisher makes a magnesium fire worse rather than better. This fundamentally changes how the material must be machined. Qualified shops manage the hazard through several practices: cutting with sharp tools at parameters that produce thicker, cooler chips rather than fine powder; controlling coolant carefully, often machining dry or with specific non-aqueous or mineral-oil-based coolants because water reacts with magnesium; rigorous housekeeping to prevent accumulation of fine chips and dust; segregated chip handling; and Class D fire extinguishing media on hand specifically for metal fires. Operators are trained on magnesium-specific procedures. Because these requirements are categorically more demanding than for aluminum or steel, the population of shops genuinely qualified for magnesium is small. When sourcing, verify the shop's magnesium experience and safety procedures directly, ask about chip control, coolant strategy, and Class D suppression, and do not assume a general aluminum shop can safely take on magnesium without dedicated experience and equipment.
Magnesium is one of the more chemically reactive structural metals and corrodes readily, particularly in moist environments and especially where it contacts dissimilar metals, which makes corrosion protection an integral part of the design rather than an afterthought. The standard approach starts with a chemical conversion coating, historically chromate-based, increasingly chrome-free equivalents, that passivates the surface and provides a base for subsequent coatings. That is typically followed by primer and a paint or sealant system for parts exposed to service environments. Equally important is galvanic protection: when magnesium is assembled against steel, aluminum, or fasteners of dissimilar metal, the magnesium becomes the sacrificial anode and corrodes preferentially at the interface, so the design must isolate the magnesium with coatings, sealants, or insulating washers and use compatible or coated fasteners. For aerospace work, the conversion coating is often a NADCAP-controlled special process, so confirm your supplier's finishing path is accredited and matches your spec. When sourcing magnesium, treat the conversion coating and galvanic isolation as required elements of both the specification and the schedule, because a bare or improperly isolated magnesium part will corrode in service.
It depends on the part's geometry and application, and many magnesium aerospace parts begin as castings. Cast magnesium alloys such as AZ91 and the rare-earth-containing ZE41A and EZ33A are widely used for housings, gearbox and accessory cases, and complex shapes, because casting produces a near-net form that minimizes the magnesium that must be machined away, which is both economical and reduces the volume of flammable chips generated. The rare-earth alloys are chosen when the part sees elevated temperatures, as in hotter engine zones, because they retain properties better at heat. Wrought magnesium alloys like AZ31B come as sheet, plate, and extrusion and suit lighter structural parts and components better made from formed or bar stock. For cast parts, the supply chain involves both a foundry and a machining operation, and you should expect NDT such as X-ray or penetrant inspection to verify the casting is internally sound, with those records supplied. When sourcing, clarify whether your part is a casting or machined from wrought stock, because the supplier base, lead time, and quality verification differ. Cast housings dominate the aerospace magnesium work in this region.
The supplier pool narrows for magnesium because the material combines specialized metallurgy with serious safety requirements that not every shop is equipped or willing to handle. The fire hazard alone, flammable chips and dust, the need for non-aqueous coolant strategies, segregated chip handling, rigorous housekeeping, and Class D fire suppression, means a shop must invest in procedures, training, and sometimes dedicated equipment before it can safely machine magnesium. Many otherwise capable machine shops simply choose not to take on magnesium because the risk and overhead are not worth it for occasional work. On top of safety, magnesium parts carry the corrosion-protection and galvanic-isolation burden, often involve castings requiring NDT, and in aerospace contexts demand AS9100, NADCAP finishing, and frequently ITAR compliance, further filtering the field to experienced aerospace suppliers. For a buyer, this means you cannot treat magnesium like aluminum and assume broad availability; you should specifically seek out shops with demonstrated magnesium experience and verify their safety and finishing capabilities. The upside of Hartford's deep aerospace base is that the region does contain shops with genuine magnesium expertise built up serving engine programs, but you must identify and qualify them deliberately rather than assuming any machining vendor will do.
Last updated: July 2026
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