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Results show that 0.2 wt.% Cu additions decrease the metastable pit initiation rate by more than an order of magnitude and slow the pit growth rate mainly by decreasing the peak pit current attained.
Road traffic and probably the existence of a fire place appear to contribute to the copper levels.
Combining a statistical analysis of slag mineralogy with other lines of evidence, we argue that copper was extracted from sulfide ores through a process of roasting and smelting in deep pit furnaces.
The relatively limited long-term pitting data that is available shows that maximum and average pit depths do not follow the power law function as conventionally assumed but tend to follow a bimodal trend with exposure time.
It is concluded that copper sheets were thinned through repeated cycles of hammering and annealing performed at temperatures achievable in an open wood fire.
The incidence of burning does not seem to increase over time as a result of the postulated transition of pit structures from domestic to ceremonial uses.
Overall, Cu additions decrease the probability of stable pit formation by decreasing metastable pit initiation and growth rates.
The observed good response and reliability of the sensor show that it should be a powerful tool for improvement of the fire refining process of the molten copper.
For the specific environment tested experimentally, the model could be used to predict the distribution of pit depths at long exposure times.
Given the in-service lifetime of the applications of copper identified in this model, most of the copper processed during the last few decades still resides in society, mostly in non-dissipative uses.

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