Publications

R I C

Click here to edit subtitle

Volume 5, Issue 3, (May–June 2016)


Effects of Conventional Heat Treatments on the Tribological Behavior of 42CrMO4 Steel

Original Research

Journal of Chemistry and Materials Research Vol. 5 (3), 2016, 39–44

Sadok Rhaiem, Mohamed Kharrat * and Maher Dammak

 

Abstract

The effects of conventional heat treatments on the microstructure, hardness, friction coefficient and wear resistance of the 42CrMo4 steel have been investigated. Three states of the 42CrMo4 steel obtained after annealing, quenching in water and quenching in oil treatments have been considered in this study. For each of these states, the microstructure has been analyzed using optical microscopy and the hardness has been measured. Friction and wear behaviors of the considered 42CrMo4 states have been characterized against 100Cr6 antagonist using reciprocating ball on flat tribometer. The results show that the friction coefficient is not too much influenced by the heat treatment and the stabilized value varies between 0.06 and 0.07. It has also been demonstrated that the 42CrMo4 steel quenched in oil has the best wear performance than the annealed steel and steel quenched in water.

 

Keywords: 42CrMo4; heat treatments, friction, wear, microstructure, hardness.

Received

Received in revised
  Accepted
22 April 2016
-
31 May 2016
 

Green Anticorrosive Oilfield Chemicals from Seed and Leave Extracts of Griffonia Simplicifolia for Mild Steel

Original Research

Journal of Chemistry and Materials Research Vol. 5 (3), 2016, 45–57

Ekemini B. Ituen *, Onyewuchi Akaranta, Abosede O. James, Shuangqin Sun

 

Abstract

Extracts from Griffonia simplicifolia (EGS) were investigated as eco-friendly alternative oilfield chemical for protection of mild steel (MS) surface in corrodible fluids associated with petroleum production. Corrosion rate was calculated in both 1M HCl and 15% HCl with and without different concentrations of the seed (SEGS) and leave (SEGS) extracts using gravimetric and electrochemical measurements. The extracts function as mixed type inhibitor and by spontaneous physical adsorption mechanism. Results from FTIR, UV-visible, SEM-EDS support possible involvement of O and N sites in adsorption by formation of surface complex protective film of EGS molecules within 60 days effective shelf life.

 

Keywords: Acid corrosion, Adsorption, Corrosion inhibitor, EIS, EFM, Griffonia simplicifolia, Oilfield chemicals, SEM-EDS.

Received
  Received in revised
Accepted
29 April 2016
-
15 June 2016