{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp12_substrate_denial72_20260805","cell_id":"inversion_of_control__chemistry_materials","arm":"CONSTRAINED_MAX","candidate_id":"inversion_of_control__chemistry_materials__CONSTRAINED_MAX","decision":"PROPOSAL","abstention_reason":null,"proposal":{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp12_substrate_denial72_20260805","cell_id":"inversion_of_control__chemistry_materials","arm":"CONSTRAINED_MAX","candidate_id":"inversion_of_control__chemistry_materials__CONSTRAINED_MAX","proposal_index":1,"version":0,"title":"Chloride-Pulled Nitrite Release from Ion-Exchange Microreservoirs in an Epoxy Steel Primer","problem":"An epoxy-coated carbon-steel surface can develop a localized scratch or pore under intermittent chloride wetting. If nitrite inhibitor is freely dispersed, general hydration rather than local chloride need determines when and where it leaches; if it is immobilized too strongly, it cannot reach a new defect. The formulation side therefore commits the release behavior before it has the spatial and temporal information present at the chloride-bearing metal/coating interface.","actors":["Carbon-steel substrate and its local metal/electrolyte corrosion cell","Amine-cured epoxy primer acting as the passive barrier","Micrometre-scale cross-linked anion-exchange beads carrying nitrite counterions","Chloride-bearing water entering through a scratch or pore","Nitrite inhibitor released near the exposed steel","Coating formulator and laboratory owner, who set composition and safety bounds but do not initiate individual release events"],"observable_state":"The decisive observable state is local chloride activity at a hydrated defect and whether it causes co-located chloride uptake and nitrite release. Supporting observations are nitrite flux, counterion occupancy remaining in the beads, spatial chloride and nitrite maps, coating impedance, localized corrosion current, underfilm corrosion, adhesion, water uptake, and intact-film permeability. Release that follows elapsed wet time equally in chloride-free media would not count as inverted activation.","consequence":"A freely mobile inventory can be spent into hydrated but low-need regions, while a tightly immobilized inventory can remain unavailable at the defect. Either mismatch can leave the local electrochemical cell insufficiently inhibited; freely soluble additives can also alter water uptake or create leaching pathways. The candidate addresses inhibitor timing and localization, not structural repair of the underlying metal or coating breach.","affected_objective":"Maintain corrosion protection at localized chloride ingress while limiting mobile nitrite inventory and preserving intact-primer cure, adhesion, and barrier properties.","intervention":"Disperse micrometre-scale cross-linked styrene-divinylbenzene beads bearing fixed quaternary-ammonium sites, converted to the nitrite counterion form, at a bounded volume fraction in an epoxy primer on carbon steel. At a hydrated defect, incoming chloride ions enter the beads and competitively exchange for bound nitrite. The exchange simultaneously retains chloride and releases nitrite near the defect. Nitrite then diffuses the short distance to exposed steel and is hypothesized, if its local ratio to chloride is sufficient, to favor a less reactive iron-oxide interfacial state. Regions without sufficient chloride are intended to retain their inventory. Fixed exchange capacity bounds the dose, and the epoxy remains the passive fallback barrier.","structural_mapping":[{"archetype_element":"Usual controller pushes action","domain_realization":"The initial formulation and general water uptake determine release from freely dispersed nitrite everywhere the primer hydrates, without local information about chloride-rich defects."},{"archetype_element":"Context Holder","domain_realization":"The aqueous microenvironment at a scratch or pore holds the relevant contextual variable: local chloride chemical activity at the metal/coating interface."},{"archetype_element":"Control Boundary","domain_realization":"The bead's hydrated ion-exchange interphase separates immobilized nitrite inventory from the surrounding primer and defect electrolyte."},{"archetype_element":"Activation Rule","domain_realization":"Release is activated only when chloride activity and exchange thermodynamics are sufficient for chloride to occupy fixed cationic sites and displace nitrite."},{"archetype_element":"Interface Contract","domain_realization":"Fixed positive sites accept accessible anions subject to charge balance, selectivity, pore transport, and finite capacity; the surrounding epoxy limits water and ion flux."},{"archetype_element":"Delegation Rule","domain_realization":"The local chloride state controls whether and where nitrite is released, but bead chemistry and loading predefine the permitted species and maximum inventory."},{"archetype_element":"Pull Rule","domain_realization":"Each successful chloride uptake event pulls a charge-equivalent amount of nitrite out of the reservoir rather than relying on a global dosing schedule."},{"archetype_element":"Feedback Signal","domain_realization":"Chloride occupancy, nitrite depletion, and interfacial current expose whether activation occurred; diminished incoming chloride flux slows further exchange without an external controller."},{"archetype_element":"Guardrail Policy","domain_realization":"Finite exchange capacity, bounded particle loading, immobilized fixed charges, and acceptance limits for cure, adhesion, water uptake, and nitrite leaching constrain activation materially."},{"archetype_element":"Override or Fallback Path","domain_realization":"The continuous epoxy matrix remains a passive barrier if exchange fails; exhausted or damaged laboratory coupons are removed rather than relying on the active reservoir."},{"archetype_element":"Audit Trail","domain_realization":"Post-exposure ion analysis and spatial mapping can show where chloride was captured and nitrite inventory was depleted; these measurements observe but do not cause release."}],"mechanism_mapping":[{"mechanism_slug":"just_in_time_replenishment_rule","role":"Chloride arrival at the site of need directly replenishes the nearby interface with a finite inhibitor dose through stoichiometric counterion exchange.","counterfactual_removal":"Replacing the exchange beads with free nitrite or a nonspecific porous carrier makes release follow hydration, diffusion, and elapsed time. Local chloride no longer initiates the dose, so the inversion mechanism is removed."},{"mechanism_slug":"recipient_triggered_support_channel","role":"The chloride-bearing defect is the material recipient of protection and activates its own local inhibitor supply through its ionic state.","counterfactual_removal":"If chloride cannot access exchange sites, or if the reservoir releases independently of chloride, the defect cannot trigger support; any remaining protection is passive barrier action or continuous dosing."}],"causal_chain":["A scratch or pore admits chloride-bearing water to a localized region of the epoxy/steel interface.","Local chloride activity rises near nitrite-form anion-exchange beads reached by the defect electrolyte.","Chloride binds to fixed quaternary-ammonium sites, and electroneutral counterion exchange displaces nitrite from the beads.","The released nitrite diffuses over a short local path toward exposed steel while the bead retains incoming chloride.","If the attained nitrite-to-chloride condition is adequate, nitrite shifts interfacial iron chemistry toward a less reactive state and reduces anodic dissolution relative to matched controls.","Low-chloride regions provide less exchange driving force and therefore are intended to retain more inventory than a freely soluble formulation.","Finite site capacity limits total release, and declining chloride influx slows additional activation."],"baseline":"Use the same epoxy with freely dispersed sodium nitrite at equal total nitrite inventory as the push-release baseline, alongside neat-epoxy and particle controls. In the free-nitrite baseline, water uptake and concentration gradients govern release rather than chloride-specific exchange; scheduled inspection and recoating remain an external fallback.","nearest_rivals":["A denser or tougher passive primer that prevents water and chloride ingress instead of releasing an inhibitor","A zinc-rich sacrificial primer whose electrochemical protection is continuously available rather than locally chloride-triggered","Free or diffusion-controlled slow-release nitrite with matched total inhibitor inventory","A chloride-scavenging particle that captures chloride but releases no active inhibitor","A pH-responsive inhibitor capsule triggered by corrosion-associated acidity or alkalinity rather than chloride exchange","A crack-ruptured self-healing capsule that mechanically seals the breach instead of modifying interfacial electrochemistry"],"remaining_contrastive_claim":"The remaining claim is mechanistic, not a general superiority claim: at matched inhibitor inventory and particle volume, a local increase in chloride activity should cause paired chloride uptake and nitrite release through counterion exchange. Any protection attributed to the candidate must depend on that conditional exchange rather than particle tortuosity, generic water uptake, continuous leaching, chloride capture alone, or an external sensing and dosing system.","authority_safety":{"decision_authority":"The materials-laboratory principal investigator and institutional chemical-safety authority jointly approve chemical inventory, exposure conditions, waste handling, and stop criteria. Their authority gates experimentation but does not control release after a coupon is exposed.","authorized_first_step":"Prepare only free-standing films and small coated carbon-steel coupons in an approved ventilated laboratory, using gram-scale nitrite-form resin batches and closed chloride-exposure vessels.","excluded_actions":["Field application or use on occupied, load-bearing, safety-critical, or environmentally exposed infrastructure","Pilot-scale coating manufacture or spraying of bead-containing formulations","Discharge of nitrite-, chloride-, epoxy-, or bead-containing liquids or solids","Human or animal exposure","Claims of novelty, safety, service life, regulatory compliance, or field performance","Deployment without separate toxicology, adhesion, durability, and failure-propagation review"],"halt_rollback":"Stop if bead preparation causes uncontrolled heating, aerosolization, pressure, or incompatible waste; if epoxy cure is disrupted; if intact-film adhesion or barrier integrity visibly fails before challenge; or if leachate cannot be contained. Close exposure vessels, remove and isolate coupons, collect all liquids and solids under the approved waste procedure, and revert to neat-epoxy controls. The laboratory-only step leaves no installed material to recall."},"negative_tests":{"strongest_counterevidence":"The strongest counterevidence would be nitrite release governed equally by water or nonchloride salts, together with any apparent corrosion response being reproduced by nitrate-form exchange beads or nonionic particles. That result would identify nonspecific leaching, chloride scavenging, or filler-induced barrier change rather than chloride-controlled inversion.","problem_falsifier":"The problem is falsified for the tested exposure if spatial measurements show that corrosion-relevant sites and times are not coupled to chloride ingress, or if freely dispersed nitrite remains available at defects throughout the bounded aging cycle without compromising intact-film properties. In either case the local chloride state lacks a meaningful timing advantage over upstream formulation.","intervention_falsifier":"The intervention is falsified if nitrite-form beads do not show chloride-contingent exchange at matched pH and ionic strength; if release is not localized near defects; if the local nitrite condition remains chemically ineffective; or if any electrochemical response is explained by nitrate-form beads, nonionic particles, or altered coating permeability rather than inhibitor release.","risks":["A subcritical local nitrite-to-chloride ratio could fail to inhibit or could worsen localized attack.","Hydrophilic exchange beads could increase water uptake, porosity, blistering, or adhesion loss.","Nitrate, carbonate, sulfate, hydroxide, or pH changes could cause false activation or suppress the intended exchange.","The resin could exhaust during an early salt exposure and provide no response to a later defect.","Particle agglomeration or surface chemistry could interfere with epoxy mixing and cure.","Nitrite, epoxy constituents, and bead dust create handling and waste hazards.","Localized electrochemical inhibition could conceal a mechanical breach without repairing it.","Analytical tracers or sectioning methods could perturb the exchange chemistry unless separately controlled."]},"next_evidence_step":"Run one blind-coded bench matrix using free-standing films and thirty 25 by 75 mm carbon-steel coupons: five formulations (neat epoxy, free sodium nitrite, nitrite-form exchange beads, nitrate-form exchange beads, and nonionic size-matched beads), each scratched and unscratched with three replicates. First compare nitrite release and chloride uptake from films in water, NaCl, and NaNO3 at matched pH and ionic strength where applicable. Then subject coupons to a fixed cyclic NaCl exposure and measure spatial nitrite/chloride distributions, electrochemical impedance or localized current, undercut, mass change, and pull-off adhesion. Set decision thresholds from assay precision before unblinding. Continue beyond this step only if the active beads show chloride-contingent local release, retain inventory without chloride, and produce a coupon response not reproduced by the exchange-only or filler controls without unacceptable intact-film degradation.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not evaluated because runtime isolation prohibits inspection of other proposals. Within this record, the candidate is distinguished as a local chemical-potential-driven ion-exchange gate, not a computational, reporting, incentive, authorization, or workflow intervention.","revision_record":{"parent_version":null,"progress_targets_addressed":["Construct a substrate-compliant chemistry/materials realization of inversion of control.","Place the activation signal at a measurable local material state rather than an external controller.","Separate the proposed causal mechanism from observational instrumentation and safety governance.","Provide matched controls capable of distinguishing responsive exchange from slow release, chloride scavenging, and filler effects."],"conceptual_changes":["Mapped downstream pull to chloride-driven counterion exchange.","Defined fixed exchange capacity as a bounded material delegation of release control.","Limited the claim to conditional localization and causal mechanism."],"operational_changes":["Specified a nitrite-form quaternary-ammonium bead embodiment in an epoxy steel primer.","Restricted the authorized action to a blind-coded film and coupon experiment.","Added free-inhibitor, exchange-only, nonionic-particle, and neat-binder comparisons."],"evidence_changes":["Prior art remains unsearched.","Specified direct ion-release, ion-uptake, coating-integrity, and electrochemical measurements.","Defined counterevidence that would reclassify the system as nonspecific slow release or passive filler action."],"claim_changes":["Made no novelty, prevalence, demand, safety, service-life, or effect-size claim.","Made inhibitor action conditional on attaining an adequate local chemical state.","Required the exchange mechanism, rather than a support wrapper, to explain any observed response."]},"substrate_contract":{"primary_allowed_process":"PHYSICAL_MATERIAL","counterfactual_independence":"After fabrication, removing all software, algorithms, sensors, analytics, reports, incentives, permissions, workflows, training, and procedural enforcement does not remove the essential effect. A coupon placed in chloride solution still undergoes ion diffusion, chloride-for-nitrite exchange, local nitrite transport, chloride retention, and interfacial electrochemical modification without computation or human activation.","forbidden_channel_audit":"No model, database, dashboard, recommender, information-routing system, or software control loop selects release. No policy, incentive, review, authorization, training program, or coordination procedure produces corrosion inhibition. Ion chromatography, microscopy, and electrochemical instruments are readouts only, while laboratory authority supplies safety containment only. The operative intervention is the material sequence of anion exchange, diffusion, adsorption or film modification, and bounded reservoir depletion; deleting every forbidden wrapper leaves that sequence intact."}}}