Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Carbon steel


Anodic Inhibitor Doped Polypyrrole Coating to Reduce Corrosion in Petroleum Medium

R.A. Anaee; W.M. Salih; H.A. Abdullah

Engineering and Technology Journal, 2017, Volume 35, Issue 9, Pages 878-886

It is known that corrosion inhibitors and coatings are the best choices to use in oil refinery; therefore, we suggested using both inhibitors and coating to get more efficiency for corrosion control. Polypyrrole coating (PPy) without and with doping by anodic inhibitors were investigated to protect the tank from corrosion in light naphtha unit at Al-Dura refinery. Polypyrrole coating was deposited as nanofibers by electropolymerization using cyclic voltammetry method. Doped polypyrrole coating was applied by adding anodic inhibitor represented by chromate, phosphate and molybdate in acidic electrolyte. The coated layers were examined by SEM/EDS, FTIR and AFM. These examinations showed that coating layers were as nanofibers on carbon steel surface with average roughness in nanoscale as follow: 24.2 nm for PO4≡/PPy, 108 nm for PPy, 122 nm for B4O7=/PPy and 139 nm for MoO4=/PPy coating. Corrosion measurements were investigated by Potentiostat in oil medium at 60oC which represent the average temperature of light naphtha unit; the results showed that the highest protection efficiency was 78.34% in the presence of PO4≡/PPy coating and the others were 77.85% for PPy, 72.64% for B4O7=/PPy and 68.83% for MoO4=/PPy coating. The presence of inhibitor within the structure of polypyrrole coating leads to repairing the defects that may be produced by corrosion process and then the protection will take a long time to be destroyed. The protection by inhibitor doped PPy suggesting reduce the ionic conductivity of coating film especially in the presence of phosphate anions, where the porosity percents was 0.00025 for PO4≡/PPy compared with other coatings (0.04794 for PPy, 0.00043 for B4O7=/PPy, and 0.13083 for MoO4=/PPy).

Alumina Nanoparticle/Polypyrrole Coating for Carbon Steel Protection in Simulated Soil Solution

R. A. Anaee; H. A. Abdullah; Gh. Z. Alsandooq

Engineering and Technology Journal, 2017, Volume 35, Issue 9, Pages 943-949

External corrosion by soil’s components is a serious problem in many steel structures such as pipelines and tanks, thus many methods are applied to reduce this risk. Nanotechnology almost gives improving for conventional protection methods.
Investigation on nano Al2O3 doped polypyrrole coating has been done on carbon steel structures to protect them in two simulated soil environments include (0.01M NaCl + 0.01M NaHCO3) and (0.01M NaCl + 0.01M Na2SO4). Electropolymerization of pyrrole monomer carried out in oxalic acid with suspended nano alumina using cyclic voltammogram method. Characterization of produced film was done by SEM/EDS and the results indicated the uniformly distribution of coating in the presence of nano alumina confirming the presence of Al2O3 NPs by EDS analysis. Also FTIR spectra showed the occurred incorporation between polypyrole and nanoalumina in deposited film on steel surface.
The presence of nano alumina behaves as repaired to healing the defects in polymer film by chemical, mechanical and electrochemical factors and then gives long life time for service; this result was concluded through the improving in protection efficiency of Al2O3 NPs/PPy film compared with conventional red paint which is uses to protect carbon steel structures.

Green Corrosion Inhibitor for Protection of Mild Steel

S.A. Ajeel

Engineering and Technology Journal, 2017, Volume 35, Issue 9, Pages 914-921

In the present work, corrosion inhibition of Mild steel in 1M H2SO4 solution by Rosmarinus Officinalis Leaves extract was studied by weight loss and potentiostatic methods. Increasing acid concentration leads to an increase in the corrosion rate of the electrode. The variable conditions used in this investigation are (100 to 1000 ppm at 25oC. Rosmarinus Officinalis Leaves extract for Mild steel. It has been found that the concentrates as a compelling consumption inhibitor for gentle steel in acidic medium. The hindrance process is credited to the development of an adsorbed film of inhibitor on the metal surface, which secures the metal against corrosion. The inhibition efficiency was observed that increase with increasing inhibitor concentration up to maximum 92% for 1000 ppm at 25 oC. The results show that the corrosion rate without inhibitor is 5.6 mpy while with inhibitor be 0.43 mpy, that is mean the corrosion rate was improved more than 90%. The effects of immersion time (2 h) at 25oC on the inhibition of corrosion have also been improved corrosion resistance. The results obtained show that Rosmarinus Officinalis Leaves Extract could serve as an excellent friendly green corrosion inhibitor. FTIR results indicate that this herb containing different chemical bonds (C-C, CH2, C-O-C, Cellulose) with steel surface producing barrier layer to protect the surface

Estimation the Efficiency of Nano Particles Coating on Carbon Steel by Atomization

Rana Afif Anaee; Ahmed M. Al- Ghaban; Douaa A. Abdullah

Engineering and Technology Journal, 2016, Volume 34, Issue 5, Pages 876-886

In this work, three nanoparticles were applied as coatings on carbon steel using atomization method (cold spraying) by airbrush.The coatings includednano Al2O3,nanoSiC and nanoZrO2 materials. The characterization of coated surfaces has been investigated by AFM and SEM. All these inspections indicated that the deposition of nanoparticles on carbon steel surface was uniform and homogeneous. Thethickness of coated layers was calculated using gravimetric method, while the particle size and roughness were measured from the analysis of atomic force microscopy.With constant conditions of coating, nano alumina coating gave the highest thickness (6.2216 nm) due to agglomeration of these particles compared with others as illustrated in SEM images. Corrosion test was performed to estimate the corrosion resistance, protection efficiency and porosity percentage which indicated the role of nano particle coating on corrosion control. These data showed that the nano alumina was better than other coatings and gave PE 99.69%.
Cyclic polarization was also estimated to show the probability of pitting corrosion. The coating with alumina gave the best data for decreasing the chance of pitting corrosion.

Studying The Effect of Copper And Zinc Ions on The Corrosion Rate of Carbon Steel

Nervana A. Abd Alameer

Engineering and Technology Journal, 2010, Volume 28, Issue 4, Pages 730-742

An experimental work was performed to study the effect of Zn, Cu ions on
the corrosion rate of carbon steel in distilled and tap water solution containing, 25
& 50 ppm concentration of Zn, Cu ions at pH range 4, 6 &8 in distilled water and
at pH8 in tap water at room temperature under both static for 10 weeks and 1, 2,
6 &12 hours with dynamic conditions. The obtained results showed that the
corrosion rate was increased in the presence of 50 ppm of Cu ions in tap water
(2.326 mpy) after 10 weeks, under static conditions, whereas under dynamic
conditions, it was reached (10.511 mpy), the presence of fine suspended solid
particles in the solutions may also cause an increase in corrosion rate due to their
movement over the carbon steel surface .In contrast, the presence Zn ions in
solution as sacrificial anode, therefore, the corrosion rate was 2.24 times less than
that in presence of Cu ions, at the same conditions. In distilled water, the
corrosion rates were decreasing slightly with adding Zinc and copper ions
comparing to absence of metals ions in solution except at pH4 in the presence
50ppm of Cu ions may be accounted due to the increasing in the conductivity of
the solution, under static conditions. At 25ppm of Zn ions lowering in corrosion
rate may be explained that the Zn ions were protected carbon steel surface by
sacrificial. In the absence of Zn, Cu ions were also carried out.