Thiazolium-Bearing Chitosan Polymer Mitigates Microbiologically and Acid-Induced Corrosion on Stainless Steel Dental Crowns and Pipeline Steel in Saliva and Pickle Liquor
Bibliographic record
Abstract
Microbiologically and chemically induced corrosion episodes degrade metal alloys, weaken their mechanical strengths, and lead to loss of constituent contents when these alloys interact with their surrounding environments. While metallic dental materials (e.g., stainless steel dental crowns) are highly susceptible to pitting corrosion induced by bacterial (e.g., Porphyromonas gingivalis ) biofilms within the oral cavity, pipeline steels can also significantly corrode in their service environments (e.g., during surface pickling or product transportation). Due to toxicity concerns, using safe and environmentally sustainable corrosion inhibitors has become a protective strategy for most metal alloys in place of chromates. The present study introduces a cationic thiazolium-bearing chitosan (CTBC) derivative utilized as an antimicrobial and inhibitor against microbiologically and acid-induced corrosion of coarse-grained 316L stainless-steel dental material and fine-grained ×70 pipeline steel, respectively. Due to the thiazolium-bearing moiety, this water-soluble chitosan polymer, with its unique antimicrobial activity against P. gingivalis, an oral Gram-negative pathogenic anaerobe, demonstrated an impressive level of enhanced biocorrosion inhibition for stainless steel dental material in saliva. Importantly, this polymer also significantly protected against ×70 pipeline steel corrosion compared to normal chitosan in pickle liquor. This instills confidence and sparks optimism about its potential applications in protecting metal alloys. Lower magnitudes of corrosion current density ( j corr ) were recorded for crown and pipeline materials in salivary culture and pickle liquor containing 100 ppm of CTBC relative to chitosan at equimolar concentration. A reverse trend was recorded for charge transfer resistance ( R ct ); higher R ct values denote polymer adsorption on pipeline steel. Over 90% corrosion inhibition efficiency was recorded for stainless steel substrates exposed to the salivary test culture with growing bacterial cells and ×70 steel substrates in the pickle liquor with 500 ppm of CTBC.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".