Magnesium Alloy Durability Patents: Leaders & Filing Trends 2026
- Filings have cooled, not grown. Annual publications fell from a 2018 peak of 76 to 10 in the most recent (partial) year, with the 2022 midpoint at 61 — a flat-to-declining trend, not an emerging one.
- Coating and alloy composition run neck and neck. C22C alloy-composition filings (997) and C23C coating/surface-deposition filings (991) are almost tied, showing the field splits nearly evenly between bulk-metallurgy and surface-treatment routes to durability.
- China dominates the filing venue, not necessarily the core IP. China receives 637 filings — more than Japan (279) and the US (263) combined-ish — while the most-cited foundational patents are decades-old US filings on alloy processing.
What this landscape covers
This landscape tracks patent families addressing magnesium alloy environmental durability — corrosion resistance, degradation control, protective barriers and related surface treatments — filed or published between 2015 and mid-2026. The corpus spans 1,847 patent families across metallurgy, coating chemistry and corrosion-testing disciplines, captured through IPC classes covering alloy composition (C22C), corrosion and metal removal (C23F) and chemical surface treatment (C23C).
Magnesium's low density makes it attractive for transport, electronics housings and biodegradable implants, but its electrochemical reactivity means every commercial use case eventually runs into a corrosion-control patent. The filings here split between changing the alloy itself — adding rare-earth or scandium content, refining microstructure — and treating its surface afterward with conversion coatings, anodising or polymer barriers. Because publication lags filing by roughly eighteen months, the low counts in the final year understate current filing activity rather than signalling an abrupt drop.
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Filing trend and technology composition
Two views of the same 1,847-family dataset: how filing volume has moved year over year, and how those filings distribute across the IPC subclasses that define the field's two main technical routes.
A field past its filing peak
Publications rose to 76 in 2018, sat near that level through the early 2020s (61 at the 2022 midpoint), and have since declined toward 10 in the most recent partial year. Read the tail years cautiously — an eighteen-month publication lag means recent filings are still arriving — but the multi-year decline from peak predates that lag effect.
Alloy composition and coating chemistry dominate
C22C (alloys) and C23C (coating and surface deposition) each account for roughly half the corpus, with C22F (non-ferrous metal treatment), B22D (casting) and C25D (electroplating) forming a secondary tier. A61L (sterilising/disinfecting) appearing at 157 records signals a distinct biomedical-implant cluster layered on top of the structural-materials core.
Shares are the percentage of the 1,847 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Magnesium Alloy Environmental Durability with Eureka
This page is one run against one query. Ask Eureka your own question about magnesium alloy environmental durability and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited foundational filings
Magnesium alloy with scandium addition for improved corrosion resistance
The present invention is to provide a magnesium alloy comprising 0.001 parts by weight to 1.0 parts by weight of scandium and the balance of magnesium and unavoidable impurities, based on 100 parts by weight of a magnesium alloy, wherein the magnesium alloy has increased Fe solubility and reduced corrosion while providing excellent mechanical properties and corrosion resistance, and a method for producing the same. The magnesium alloy of the present invention can improve the corrosion resistance of the magnesium alloy by using scandium which can simultaneously prevent from microgalvanic corrosion between a substrate and impurities without deteriorating mechanical properties.Filed by Korea Institute of Materials Science; issued 2021.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5073207A | Process for obtaining magnesium alloys by spray deposition | 121 |
| 2 | US4134759A | Light metal matrix composite materials reinforced with silicon carbide fibers | 112 |
| 3 | US4997622A | High mechanical strength magnesium alloys and process for obtaining these alloys by rapid solidification | 111 |
| 4 | US20080031765A1 | Magnesium alloy and the respective manufacturing method | 98 |
| 5 | US5494538A | Magnesium alloy for hydrogen production | 97 |
| 6 | JP2008069418A | High strength magnesium alloy with excellent corrosion resistance | 74 |
| 7 | US5143562A | Broadly applicable phosphate conversion coating composition and process | 74 |
| 8 | US6139651A | Magnesium alloy for high temperature applications | 67 |
| 9 | EP1857570A2 | Method for forming a nickel-based layered structure on a magnesium alloy substrate, a surface-treated magnesi… | 63 |
| 10 | JP2000080309A | Corrosion resistant paint and corrosion resistant steel material coated with same | 63 |
Citation counts accumulate over time and favour older filings; treat this table as a map of foundational influence, not of current filing activity.
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Browse MCP servers →What the numbers mean for a filing decision
Reading filing volume, citation weight and geography together points to where claim space is genuinely occupied versus where it only looks that way.
Volume has cooled from its 2018 high
The decline from a 2018 peak of 76 to a 2022 midpoint of 61 and down toward 10 in the most recent year suggests the core alloy-and-coating claim space filled up earlier in the window, with new entrants now filing into narrower, more specific niches rather than broad compositions.
Two nearly equal routes to durability
Bulk alloy-composition changes (C22C) and surface coating/deposition treatments (C23C) are filed in almost identical volume, meaning neither approach has won out — a new filer needs freedom-to-operate analysis across both disciplines, not just one.
China leads filing venue by volume
China's 637 filings outpace Japan (279), the United States (263) and the EPO (219) individually, indicating that current commercial and defensive filing activity concentrates there even though the most historically cited foundational patents were filed in the US decades earlier.
A tight cluster of Japanese automotive-and-surface-treatment co-filers
The strongest co-assignee pairs link a Japanese surface-treatment specialist with two Japanese automakers, each pairing appearing 11-12 times — a pattern consistent with joint development of corrosion-resistant magnesium components for vehicle parts rather than open licensing.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to magnesium alloy environmental durability, with the prior art for and against each one.
Who is filing, and where the gaps sit
Filing activity concentrates among a handful of Japanese, Korean and Chinese materials and automotive organisations, but recent-year momentum has gone quiet across the most active historical filers, and several technically adjacent sub-areas remain thinly claimed.
Japanese OEM-supplier pairings anchor the historical core
A Japanese surface-treatment specialist paired with two Japanese automakers forms the densest collaboration network in the dataset, reflecting sustained joint work on corrosion-resistant magnesium components for vehicle applications.
Historical leaders show no filings in the most recent year
Every one of the assignees with the strongest historical presence — spanning Japanese, Korean and steel-industry filers — recorded zero filings in the latest year, consistent with the broader decline in publication volume rather than any single company exiting the field.
A distinct implant-grade durability cluster
The presence of 157 A61L-classified records alongside a scandium-alloy example built for corrosion control shows a biomedical implant sub-field running in parallel to the structural-materials mainstream, with its own composition and biocompatibility constraints.
| Assignee | Recent year | YoY |
|---|---|---|
| Sumitomo Electric Industries, Ltd. | 0 | — |
| Nihon Parkerizing Co., Ltd. | 0 | — |
| Toyota Motor Corporation | 0 | — |
| Nisshin Steel Co., Ltd. | 0 | — |
| POSCO | 0 | — |
| Korea Institute of Industrial Technology | 0 | — |
| Biotronik AG | 0 | — |
| Institute of Metal Research, Chinese Academy of Sciences | 0 | — |
Where to take this analysis
The trend and composition data point to specific next steps depending on whether you are scouting freedom-to-operate, tracking a competitor, or scoping new R&D.
Check the under-claimed branches first
Before filing into the crowded C22C/C23C core, run a targeted search across the thinner sub-areas identified here, such as rare-earth-free inhibition or gradient conversion coatings, to see whether the low count reflects genuine white space or simply narrower classification.
Explore white space in EurekaVerify the momentum drop isn't an artefact
Because publication lags filing by around 18 months, confirm whether the zero-filing latest year for leading assignees reflects a real slowdown or applications still in the examination pipeline.
Track assignee activity in EurekaMap the co-filing network before approaching partners
With only 10 co-assignee pairings in the whole corpus, the automotive-surface-treatment cluster is a tight, identifiable group — useful context before proposing licensing or joint development conversations.
Trace collaboration patterns in EurekaCommon questions about this landscape
The core classes are C22C for alloy composition, C23C for coating and surface deposition treatments, and C23F for corrosion and metal removal processes specifically. C22F (non-ferrous metal heat treatment) and C25D (electroplating and electroforming) frequently appear alongside them because heat treatment and electroplating are common routes to improving a magnesium surface's corrosion behaviour. A61L also shows up where the durability claim is tied to a biomedical implant application rather than a structural one.
Based on this dataset, filing volume peaked in 2018 at 76 records and has declined since, sitting at 61 by the 2022 midpoint and falling toward 10 in the latest partial year. That said, publication lags filing by roughly 18 months, so the most recent one or two years will always look artificially low and should not be read as a sudden stop. The multi-year decline from the 2018 peak, however, predates that lag effect and looks like a genuine cooling.
Both, in almost equal measure. C22C alloy-composition filings (997) and C23C coating and surface-deposition filings (991) are nearly tied in this corpus, meaning there is no dominant technical approach to magnesium durability. Anyone assessing freedom to operate needs to search both disciplines rather than assuming one route is safer than the other.
US10947609B2, assigned to Korea Institute of Materials Science and issued in 2021, claims a magnesium alloy containing a small scandium addition (0.001 to 1.0 parts by weight per 100 parts of alloy) that increases iron solubility and reduces microgalvanic corrosion between the substrate and impurities. The claim is narrow in composition range but specific in mechanism, targeting the iron-impurity corrosion pathway rather than corrosion resistance broadly. Anyone formulating a scandium-bearing magnesium alloy in a similar concentration band for corrosion control should review this patent's claim scope closely.
China leads with 637 filings at its receiving office, ahead of Japan (279), the United States (263) and the European Patent Office (219). South Korea (87) and PCT/WIPO international filings (69) are smaller but notable, including some of the more specific recent alloy-composition claims. Filing venue reflects where applicants seek protection, which does not always match where the most historically influential or most-cited patents originated — several of the most-cited records in this corpus are older US filings.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.