13th International Conference on Fracture June 16–21, 2013, Beijing, China Where: WI is the weight of the inhibited sample, and Wu is the weight of the uninhibited sample. Example 2 Performance of the Inhibitor (AO) under Controlled Conditions of Heat and Mass Transfer (Cathodic Region): The effect of fluid flow, bulk temperature and heat transfer on the cathodic current density at a given cathodic potential of 0.1V below the corrosion potential are shown in Tables 1, 2, and 3 (Appendix I). It can be seen from Tables 1, 2 and 3 that the cathodic current density values are independent of the flow rate, while the increase in temperature (bulk or interfacial) has a significant effect in stimulating the cathodic process [17]. This confirms the activation energy control of the cathodic reaction of hydrogen as the predominant reaction, as well as the lack of mass transfer effect on the adsorption processes of the inhibitor [18]. The increase in temperature (bulk or interfacial) has no significant effect on the inhibition efficiency, viz. the increase in temperature has no effect on the orientation of the adsorbed molecules or their geometry [19]. The high efficiency values are attributed to the ability of the inhibitor, acridine orange, to block the cathodic areas on the metal surface, leading to a significant reduction in hydrogen evolution [18]. Example 3 Acridine orange (AO) also showed high performance in blocking the anodic sites, as shown in the data presented in Tables 4, 5 and 6 (Appendix I). for both isothermal and heat transfer conditions [20]. The inhibition of the anodic sites (Tables 4-6) and cathodic sites (Tables 1-3) confirm the mixed effect of the inhibitor [15, 20]. The invention is not limited to the embodiments described above. The details involved in the description of these embodiments are for illustrative purposes only. Reasonable variations and modifications of this invention will be apparent to those skilled in the art without departing from the spirit and scope thereof. 4. Conclusion What is claimed is: 1. A process for cleaning and inhibiting scale formation on the surfaces of process equipment which contacts circulating water and/or chemicals, which consists of: contacting the process equipment surfaces for a period of about 8 hours and at a temperature of about 300 °C and higher, which is effective to effect cleaning and/or scale inhibition with a aqueous composition consisting of:
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