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TRANSCRIPT
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)
0
100
200
300
400
keV
10 15 20 25 30
balzac join green corosionbalzacbase.40.3balzacspot1.40.3balzacspot2.40.3balzacspot3.40.3balzactoe.40.3
Pb LPb L
Cu sum peaks
Sn K
Sn KRh 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
0
10000
20000
30000
40000
keV
5 6.67 8.33 10
balzac join green corosionbalzacbase.40.3balzacspot1.40.3balzacspot2.40.3balzacspot3.40.3balzactoe.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.
0
250
500
750
1000
keV
2 3.83 5.67 7.5
balzac join green corosionbalzacbase.40.3balzacspot1.40.3balzacspot2.40.3balzacspot3.40.3balzactoe.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 15.15balzac join green corosion 1515balzacbase.15.15balzacspot1.15.15balzacspot2.15.15balzacspot3.15.15balzactoe.15.15Cl
S
There is a trace of Cl in the joint and a trace of S in spot 2.
0
200
400
600
800
keV1 2.63 4.25 5.88 7.5
balzac clean spot 15.15balzac join green corosion 1515balzacbase.15.15balzacspot1.15.15balzacspot2.15.15balzacspot3.15.15balzactoe.15.15
The join contained Fe and Ca build up,. Likely the product of water from sprinklers drying over the years.