rust
Enable an agent to recognise iron-corrosion products as rust, assess their condition and implications for the affected material, and select evidence-based inspection, containment or treatment actions.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise iron-corrosion products as rust, assess their condition and implications for the affected material, and select evidence-based inspection, containment or treatment actions.
Rust is a variable assemblage of iron oxides, oxyhydroxides and associated water formed by corrosion of iron or iron-bearing alloys, usually through electrochemical reactions involving moisture and oxygen.
It can be Classify a suspected deposit using substrate history, inspection and proportionate analytical confirmation.; Map rust coverage and morphology against repeatable locations on an affected surface.; Sample attached deposits or detached residues while preserving their location and exposure context.; Compare observations over time to identify progression, shedding or recurrence.; Select and document removal, retention or stabilisation criteria appropriate to the substrate and intended use.; Trigger a separate host-object assessment when rust observations suggest concealed damage or compromised function..
Distinguishing features
An identification as rust requires evidence connecting the material to corrosion of an iron-bearing source; an orange or brown colour alone is insufficient.
Rust can be a heterogeneous deposit rather than a pure compound, so assigning one formula or chemical identifier to every rust sample is inappropriate.
Manufactured iron-oxide pigment can resemble rust chemically and visually; production history and its relationship to a corroding substrate distinguish the intended identities.
Mill scale and other heat-formed oxide layers require formation-history evidence to distinguish them from rust, especially where later corrosion has altered their surfaces.
Rust denotes corrosion products: a stained surface, measured metal loss and an active corrosion process are related observations but are not interchangeable identities.
Scope
+ Identification of rust and distinction from other deposits, coatings and iron-containing materials
+ Composition, retained moisture, contaminants and heterogeneity of rust deposits
+ Deposit coverage, thickness, texture, adhesion and distribution
+ Relationships to the iron-bearing substrate, exposure environment and observed progression
+ Rust-specific inspection, sampling, removal, stabilisation and follow-up criteria
- The Rust programming language and fungal rust diseases
- General corrosion mechanisms and corrosion products of nonferrous metals
- Complete engineering assessment or remaining-life certification of the host object
- Manufactured iron-oxide pigments and mineral specimens without a corrosion-product identity
- Specifications for commercial rust removers, converters and protective coatings
- Complete maintenance programmes for buildings, vehicles or machinery
Characteristics
- Identification confidence
- suspected | supported | analytically characterised; record evidence and limitations Prevents visual resemblance from becoming an unsupported material identification.
- Source substrate
- linked iron-bearing material or object; attached | transferred | detached | origin unknown Distinguishes corrosion at the observed location from rust transported from another source.
- Constituent phases
- identified phases or unresolved mixture, with analytical method and sampling location Records the actual assemblage without treating rust as a single pure substance.
- Deposit coverage
- % of a defined inspected area, with imaging or estimation method Supports repeatable comparisons while keeping surface coverage distinct from metal loss.
- Deposit thickness
- µm or mm; location, method and uncertainty required Describes accumulation and variation without assuming that deposit thickness equals consumed metal thickness.
- Deposit morphology and adhesion
- powdery | flaky | layered | compact | mixed; adhesion recorded separately by stated method Informs sampling, shedding control and the feasibility of treatment.
- Moisture and soluble contaminants
- moisture content and contaminant concentrations with units, analytical method and wet/dry basis Helps explain persistence or recurrence and identifies limits of surface-only treatment.
- Observed progression
- increasing | no detectable change | decreasing after intervention | unknown; observation interval required Separates time-series evidence from assumptions based on a single inspection.
- Treatment history
- linked cleaning, conversion, stabilisation or coating events with dates and outcomes Explains altered appearance and supports evaluation of recurrence.
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.rust-plant
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 17 findings · 25 questions.
Rust identity and boundaries Establishes whether a deposit is an iron-corrosion product and what material the identification covers.
Colour, iron content and oxide chemistry alone can confuse rust with pigments, transferred stains or heat-formed scale.
Corrosion-product identity
Connects the observed material to an iron-bearing corrosion source.
Source-linked identification
The model records the evidence supporting rust identification and whether the source is local, remote or unknown.
- What evidence identifies this material as a product of iron corrosion rather than merely an iron-coloured deposit? definition
- Did the rust form on this substrate, arrive through runoff or transfer, or become detached from an unknown source? provenance
Mixture and lookalikes
Separates the rust assemblage from lookalike materials and independently identified constituents.
Assemblage-specific identity
The model permits an unresolved mixture and attaches chemical identifiers only to constituents or characterised materials for which they are justified.
- Which constituents have been identified, by what method, and which parts of the deposit remain unresolved? measurement
- What evidence distinguishes this sample from manufactured pigment, natural mineral material or heat-formed oxide scale? boundary
Formation and exposure context Relates rust occurrence to its substrate, water exposure and local deposit environment.
Rust at an exposed face, beneath a coating or in a water-retaining joint can require different investigation and treatment.
Substrate and location
Locates rust relative to the host material and its surface protection.
Formation-site context
The model records the underlying material and whether rust occurs on bare metal, at coating defects or in concealed interfaces.
- What iron-bearing substrate is associated with the deposit, and how was its material identity established? provenance
- Is the rust exposed, beneath a coating, within a joint or present only as a stain on an adjacent material? boundary
Wetting and contaminants
Records exposure conditions and deposit constituents relevant to continued deterioration.
Local exposure evidence
The model separates observed wetting and measured contaminants from inferred causes of rust formation.
- What evidence describes condensation, immersion, leakage or wet-dry cycling at the rust location? provenance
- What moisture or soluble-contaminant measurements exist, and what sampling basis and detection limits apply? measurement
Deposit condition and progression Characterises rust accumulation and change while separating deposit observations from substrate damage.
Visible rust extent does not by itself establish corrosion activity, metal loss or structural acceptability.
Deposit morphology
Describes measurable coverage, thickness, texture and attachment.
Mapped deposit condition
The model preserves spatial variation and the methods used to describe the deposit.
- What are the rust coverage and thickness over a defined inspection area, and how uncertain are those measurements? measurement
- Where is the deposit powdery, flaky, layered or compact, and what evidence establishes its adhesion? measurement
Change and damage interface
Tracks change and identifies when a separate assessment of the host material is needed.
Progression without a damage proxy
The model records repeat observations and links independent metal-loss evidence without deriving it from rust appearance alone.
- Do comparable observations show new deposits, expanding coverage, shedding or recurrence over a stated interval? measurement
- What independent evidence of pitting, section loss or impaired function requires assessment through the host object's model? action
Rust treatment and verification Supports decisions about retaining, removing or stabilising rust and checking the outcome.
A successful intervention must address the intended surface condition and exposure context, with evidence beyond a change in colour.
Intervention selection
Records treatment objectives, substrate constraints and relevant residue composition.
Compatible treatment objective
The model ties treatment to a stated purpose and records limits arising from the substrate, historical significance, coatings and contaminants.
- Should this rust be retained, sampled, removed or stabilised, and what intended use or conservation objective determines that choice? action
- What substrate sensitivities, adjacent coatings or measured contaminants constrain treatment and handling of removed material? action
Outcome and recurrence
Defines evidence for treatment completion and subsequent monitoring.
Verified rust treatment
The model records residual deposits, changes to the exposure source and time-based follow-up rather than treating appearance alone as proof of success.
- What observable or measurable endpoint establishes that the selected treatment objective has been met? action
- When and under what exposure conditions will the surface be checked for residual contamination, renewed rust or coating failure? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The PHY.MAT domain is interpreted as iron corrosion products, not the programming language or fungal plant diseases.
- Composition varies with alloy, exposure and age; rust has no universal formula, purity, melting point, boiling point or hazard classification.
- Green rust is a technical phase-family term; verify its inclusion against the intended registry scope. Standard editions and applicability also require checking.
- Which of these check these first hold for the sense of rust this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Atmospheric rust
- Chloride-bearing rust
- Green rust, a family of mixed iron(II)/iron(III) hydroxide phases that can occur as corrosion intermediates
- Which of these kinds and varieties hold for the sense of rust this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- CAS Registry Number - Component-specific identifiers - Rust is not a single compound with a universally applicable CAS number; identify its constituent phases when chemical identity matters.
- Which of these identifiers and schemes hold for the sense of rust this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- ISO 8501-1, issued by the International Organization for Standardization, specifies visual rust grades and preparation grades for steel substrates before application of paints and related products.
- ASTM D610, issued by ASTM International, provides a practice for evaluating the degree of rusting on painted steel surfaces.
- Which of these standards and regulation hold for the sense of rust this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Visible rust supports inspection and maintenance decisions for iron and steel assets.
- Controlled corrosion produces decorative patinas on iron and steel.
- Weathering steels develop rust layers that can slow further corrosion under suitable exposure conditions.
- Which of these real-world use hold for the sense of rust this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Surface area visibly rusted - 0-100 - %
- Which of these typical measurements hold for the sense of rust this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Corrosion consumes underlying metal, potentially reducing load-bearing capacity and causing perforation.
- Expansion of corrosion products can crack and spall concrete surrounding steel reinforcement.
- Rust beneath coatings can cause blistering, loss of adhesion and coating failure.
- Loose rust can contaminate fluids, obstruct passages and interfere with moving parts.
- Rust appearance alone does not reliably establish the depth of metal loss or remaining structural capacity.
- Which of these failure modes and hazards hold for the sense of rust this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Marine salt exposure and road de-icing salts can change rust composition and accelerate corrosion.
- Humidity, wet-dry cycling and atmospheric pollution influence rust formation and whether a relatively protective layer develops.
- Which of these regional variation hold for the sense of rust this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Corrosion - Corrosion is the deterioration process; rust is a class of iron-containing corrosion products.
- Iron oxide - Iron oxide names a chemical class that includes deliberately manufactured materials; rust is identified by its corrosion origin and commonly contains oxyhydroxides and water.
- Mill scale - Mill scale forms through high-temperature oxidation during steel processing; ordinary rust forms through moisture-mediated corrosion.
- Patina - Patina is a broader term for an altered surface layer on a material; a patina on iron or steel may consist of rust.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of rust this model covers, and on what evidence? provenance
What the second pass must settle
- Which constituent phases and mixed deposits should the registry explicitly include under rust, particularly where heat-formed scale has subsequently corroded?
- Which inspection or analytical methods provide sufficient identification confidence for ordinary maintenance versus conservation or laboratory use?
- What application-specific criteria distinguish acceptable retained rust from deposits requiring removal or further substrate assessment?
- Which validated methods and observation intervals should be used to assess progression under different wetting and coating conditions?
- How should constituent identifiers, hazard classifications and waste requirements be represented for rust mixed with salts, alloy constituents or old coating residues?