Balzac - balzac clean spot 15.15 balzac join green corosion 1515 balzacbase.15.15 balzacspot1.15.15

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Text of Balzac - balzac clean spot 15.15 balzac join green corosion 1515 balzacbase.15.15 balzacspot1.15.15

  • Toe

    Spot 3

    Spot 1

    Spot 2

    Clean Spot

    Joint Base to Statue

    Base

    Balzac

    Bronze corrosion and patina analysis

  • The following slides are produced utilizing excel over lays of spectra taken on the Balzac sculpture in June before the statue was re patinated. •2 sets of data were taken with a 0.001” Cu filter in the Bruker handheld xrf instrument.

    •One at 40kV and 3 micro amps (the first 3 slides below). •The other set was taken at 15 kV and 15 micro amps (the last 2 slides below)

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    100

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    keV

    10 15 20 25 30

    balzac join green corosion balzacbase.40.3 balzacspot1.40.3 balzacspot2.40.3 balzacspot3.40.3 balzactoe.40.3

    Pb L Pb L

    Cu sum peaks

    Sn K

    Sn K Rh elastic and

    inelastic scatter

    The Cu alloy contains a small amount Zn, Sn and a trace of Pb. See next slide for Cu and Zn

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    10000

    20000

    30000

    40000

    keV

    5 6.67 8.33 10

    balzac join green corosion balzacbase.40.3 balzacspot1.40.3 balzacspot2.40.3 balzacspot3.40.3 balzactoe.40.3

    Cu K

    Cu K

    Zn KFe K

    The Cu from the bulk alloy is attenuated depending on the thickness of the corrosion. Based on this the corrosion is thickest in the joint.

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    250

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    keV

    2 3.83 5.67 7.5

    balzac join green corosion balzacbase.40.3 balzacspot1.40.3 balzacspot2.40.3 balzacspot3.40.3 balzactoe.40.3

    Fe K

    Fe K

    Ca K

    The join contained Fe and Ca build up,. Likely the product of water from sprinklers drying over the years.

  • 0

    13

    25

    38

    50

    1.5 1.93 2.35 2.78 3.2

    balzac clean spot 15.15 balzac join green corosion 1515 balzacbase.15.15 balzacspot1.15.15 balzacspot2.15.15 balzacspot3.15.15 balzactoe.15.15Cl

    S

    There is a trace of Cl in the joint and a trace of S in spot 2.

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    keV 1 2.63 4.25 5.88 7.5

    balzac clean spot 15.15 balzac join green corosion 1515 balzacbase.15.15 balzacspot1.15.15 balzacspot2.15.15 balzacspot3.15.15 balzactoe.15.15

    The join contained Fe and Ca build up,. Likely the product of water from sprinklers drying over the years.