The use of ASTM 4060 Tabor Abrasor Testing has long been the standard for comparing the wear characteristics of different coating systems. This has been done with standard impregnated rubber disks to allow for the industry to look across companies and compare the abrasion resistance of different products. With different coating systems gaining acceptance into artificial lift well applications a desire for a similar test method that allows for evaluating the wear of coating on coating rod guide on coating and rod guide on liner has arisen. This paper will outline the development of a modified test protocol for ASTM 4060 to allow for comparible testing of different polymeric materials under defined repeatable conditions. 

Corrosion of reinforcing steel is a leading cause of concretedeterioration such as spalling cracking and delamination of reinforced concrete structures.This paper describes a new self-powered two stage anode system used to control corrosion in reinforced concrete structures. This two-stage system combines the high level performance of an impressed current cathodic protection system (ICCP) with the long-term maintenance-free capabilities of an alkali-activated galvanic cathodic prevention system (GCP).Impressed current and galvanic corrosion protection systems are beneficial in extending the service life ofchloride contaminated and damaged concrete structures. ICCP systems are typically powered by an outside DC power source such as a transformer/rectifier and can provide a lifetime of corrosion protection if suitably maintained. Galvanic systems use metals such as zinc that are more electronegative than steel in concrete. Galvanic systems are often used when simplicity is desired as there is no power supply involved and maintenance is minimal.This single-unit second generation hybrid system does not require complex wiring or an external DC power supply. Once installed the anode automatically provides an initial phase of high charge density that passivates active corrosion (Stage 1). The anode automatically switches to provide long-term maintenance-free galvanic protection (Stage 2) when the impressed current stage is complete.As a result this self-powered two-stage system provides a long-term maintenance-free corrosion protection alternative for reinforced concrete structures.

Surface layers and deposits of iron sulfides formed from sour corrosion may exhibit both protective and corrosive properties depending on the types of iron sulfide formed and the physical structure of the layers. The protective barrier and blocking effects of the layers may be counteracted by significant cathodic activity on the surfaces of electrically conductive iron sulfides and galvanic corrosion of the underlying steel surface. Experimental and modelling work wereperformed to quantify the effects that parameters such as layer thickness and porosity H2S partial pressure temperature and pH can have on the electrochemical reactions aqueous equilibria and mass transport processes governing the corrosion rate. The results were discussed in the light of available literature and compared torelevant experimental sour corrosion data including both native corrosion product layers and applied iron sulfide deposits (UDC).