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Looking for damage dose relations using metal sensors

Looking for damage dose relations using metal sensors. Bart Ankersmit Simon Watts Virginia Costa. INTRODUCTION. Pollutant. Metal. Amount / Composition / Time ?. CORROSIVE ATMOSPHERES. Mimmic museum atmosphere: SO 2 / NO x / O 3 Organic acids (HAc / Formic Acid) / Formaldehyde

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Looking for damage dose relations using metal sensors

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  1. Looking for damage dose relations using metal sensors Bart Ankersmit Simon Watts Virginia Costa

  2. INTRODUCTION Pollutant Metal Amount / Composition / Time ?

  3. CORROSIVE ATMOSPHERES • Mimmic museum atmosphere: • SO2 / NOx / O3 • Organic acids (HAc / Formic Acid) / Formaldehyde • Sulfides (H2S / OCS) • Concentrations: • Background levels • 10x higher (museum event) • 10x higher (lab concentrations)

  4. Cu & Ag Tokens Composition of surface Onguard f (t, pollutants) Mass increase

  5. Short term measurement Non-specific ‘natural aging’ Dutch archival law Present in some museums 12 provincial archives

  6. Piezo Electric Crystal Frequency (Hz) Accept / not acceptable Å (t) ?

  7. oven - H2S - SCO - HAc - HAc / FAc

  8. Purafil: Extremely pure air Data against “background” air (22 oC / 50%)

  9. SCO: copper more reactive than silver HAc + FAc: copper 2 reaction products ELECTRO CHEMICAL ANALYSIS OF COUPONS

  10. Why? What can be done? Silver tarnishing

  11. Deployment QMB Ventilation + Recirculation Recirculation

  12. V+RC = 74 Å/yr Silver yellow in 2 years RC = 32 Å/yr Silver yellow in 5 years

  13. CONCLUSIONS [Pollutants]  reaction products f  [Pollutants] is unclear QMB is not behaving the same way as the tokens Hanging issues

  14. Open issues Uneven tarnishing / corrosion? Fequency drift? Δf ↔ ΔM ↔ degradation of mixed collection

  15. RH / T effect on frequency?

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