Posted February 18, 2017 by Rino Rakhmata Mukti, Dr. rer.nat in Uncategorized

Laboratory for Dynamic Testing of Corrosion Inhibitors

Background

Corrosion is the degradation process due to interaction between materials and their environment. Corrosion is well recognized as a multidiscplinary field which comprises of scientific as well as engineering disciplines ranging from thermodynamics, electrochemistry, biochemistry including economy.

Several types of corrosion have been known pertinent to the field of oil and gas production, namely carbon dioxide, galvanic, microbial and erosion corrosion as well as stress corosion cracking. Most of such corrosion involves metals in aqueous environment along with oils, gases and/or condensate in a typical multiphasic system.

In the various production stages of oil and gas industries, corrosion might take place either during transportation of the oil/gas or in the refining process. As solution to mitigate the corrosion problem, there are four approaches which could be pursued, i.e. through the modification on the metallurgical aspects of the materials, through modification on the environmental condition, through surface protection, or even through process parameters optimization.

Corrosion inhibitors have been generally employed in surface protection of materials used in this type of industries, whether used in process fluids, cooling fluids as well as heating/heat transfer fluids. In order to get inhibitors with optimum performances with respect to their protection efficiencies they can provide and other process requirements such as emulsification and frothing tendencies, a reliable screening technique is deliberately required. So far, it has been generally accepted that the most effective way of corrosion inhibitor laboratory screening is through electrochemical testing.

Apart from being one of practical techniques in the corrosion inhibitor selection, electrochemical techniques are also very effective in the research and investigation toward new materials, new process media formulation as well as in establishing optimum process parameters.

Activities

To provide services in the form of laboratory research and testing as well as training and courses within the field of corrosion and corrosion testing in particular corrosion related to oil and gas production.

Laboratory Research Services

1. Research services which are provided encompassing studies within the field of:
2. Metallic corrosion in aqueous media
3. Corrosion inhibitor performance in oil-water-gas environment
4. Corrosion in high flow rate/shear stress
5. Inhibitor molecular structure-physicochemical properties relationship
6. Surface/interfacial chemistry of adsorption and corrosion inhibition mechanism in metallic surfaces

Laboratory Analysis and Testing Services

Analytical and testing services which are provided comprise of:
1. Corrosion coupon analysis
2. Corrosion resistant materials selection
3. The most non-corrosive media selection
4. Selection of process parameters pertaining to most non-corrosive conditions
5. Corrosion inhibitor screening

There are two main types of tests within the corrosion inhibitors screening namely:
1. Physicohemical properties tests which include: IR scan fingerprinting analysis, inhbitor aggresivity in concentrated solution, frothing/foaming tendency, emulsion stabilizing tendency, decanted water quality, thermal stability and partition coefficient.
2. Electrochemical corrosion tests which include: a semi-static test by means of the so-called Bubble Test and a dynamic test by means of the so-called Jet Impringement Test.

Although it has already been subjected to several improvements, this laboratory whcih is a donation from TotalFinaElf Indonesie, was initially intended to be exactly a copycat of facility to TotalFinaElf in Le Havre, France.

Corrosion Training and Course Services

Course and training in the corrosion testing by means of electrochemical methods consists of the following techniques:
1. Potentiostatic measurements.
2. Polarization Resistance tenchniques.
3. Tafel plots methods.
4. Cyclic voltammetry
5. Electrochemical Impedance Spectroscopy
6. Chronoammperometry
7. Chronocoulometry
8. Chronopotentiometry
9. Pitting Corrosion

For futher information, please contact Dr. Bunbun Bundjali