Corrosion Behavior of a High-Chromium Duplex Stainless Steel with Minor Additions of Ruthenium in Sulfuric Acid

Potgieter, J.H.; Brookes, H. C.

doi:10.5006/1.3293596

Cited by 11 publications

(7 citation statements)

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“…Potgieter and Brookes 2 concluded that there is a maximum amount of ruthenium that can be added to stainless steel to improve corrosion resistance. The current work further showed that the optimal Ru concentration depends on the particular environment.…”

Section: Resultsmentioning

confidence: 99%

“…Tjong et al 1 showed with only the addition of up to 0.2 wt-% Pd and Ru that corrosion resistance improved in reducing acids. Stainless steels alloyed with Ru have been gaining focus in recent years by, for example, Potgieter and Brookes, 2 Banda and Van der Merwe, 3 Govender et al , 4 Myburg et al , 5 Tjong 6 and Sherif et al , 7 all clearly stated that both the general and pitting corrosion resistance is significantly increased by alloying with small amounts of Platinum Group Metals (PGMs). They found corrosion resistance is dependent on PGM concentration and the environment.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion resistance of laser cladded 304L stainless steel enriched with Ru in hydrochloric acid

Merwe

Tharandt

2016

Corrosion Engineering, Science and Technology

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The corrosion behaviour of laser surface cladding made from 304L stainless steel alloyed with varying concentrations of ruthenium in 1M HCl at 25°C was evaluated, fresh and after 12 hours, by electrochemical tests including open circuit potential and potentiodynamic polarisation scans. The ruthenium concentration in the 800 µm cladded layer varied from 0.82 wt-% to 4.67 wt-% ruthenium. The ruthenium doped samples were compared against a 304L stainless steel laser surface cladding with no ruthenium, 304L stainless steel samples with no laser cladding, 316L stainless steel, SAF2205 duplex stainless steel and Hastelloy C276®. Initial passivation was not observed in the 1M HCl but after 12 hours the addition of ruthenium led to reduced corrosion rates and improved passivation characteristics compared to the surface cladding without ruthenium. An optimum ruthenium range was observed between 3 wt-% and 5 wt-%. It was shown that at this optimum concentration, the ruthenium containing stainless steel clad on 304L stainless steel can compete commercially with the SAF2205 and Hastelloy C276® as long as the clad is 200 µm or less.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion resistance of laser cladded 304L stainless steel enriched with Ru in hydrochloric acid

Merwe

Tharandt

2016

Corrosion Engineering, Science and Technology

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“…The shift of corrosion potentials to nobler values was attributed to the accumulation of precious metals on the surface of TiAl alloys, which simultaneously improved the hydrogen evolution efficiency and inhibited anodic dissolution. 16 To confirm these explanations, SEM and EDX were conducted on the corroded surfaces to evaluate the precious metal content on the surfaces of alloys subjected to potentiodynamic scans in 25 wt-%HCl solution. The corrosion tests corresponded to an exposure of samples to 25 wt-%HCl solutions for 180 min, 30 min of which were in OCP.…”

Section: Accumulation Of Precious Metals On Corroded Tial Alloysmentioning

confidence: 99%

“…Precious metals are also used to increase the corrosion resistance of stainless steels and nickel. [15][16][17][18][19][20][21] Figure 1 is a schematic diagram of a metal showing active to passive transition.…”

Section: Introductionmentioning

confidence: 99%

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Effect of platinum group metal addition on microstructure and corrosion behaviour of Ti–47·5 at-%Al

Mwamba¹,

Cornish²,

Lingen³

2013

Corrosion Engineering, Science and Technology

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Plain and alloyed titanium aluminides of composition Ti-47?5 at-%Al were prepared with the addition of 1?0 at-% platinum group metals (PGMs). The as cast alloys were subjected to potentiodynamic scans in 5, 15 and 25 wt-%HCl solutions at room temperature, and the PGM containing alloys were assessed for their abilities to spontaneously passivate by cathodic modification. Plain titanium aluminide had a duplex microstructure consisting of lamellar (a 2 and c alternating lamellae) and c-TiAl phase grains. The introduction of 1?0 at-%PGMs (platinum, palladium and iridium) led to the formation of a new phase, developing more in the c-TiAl phase grains and a general improvement of corrosion resistance by increasing the corrosion potential to nobler values. Platinum group metal additions to plain TiAl resulted in the corrosion potentials falling in the passive region of plain TiAl, indicating spontaneous passivation of PGM alloyed TiAl in 5 and 15 wt-%HCl solutions. In 25 wt-%HCl solution, the addition of PGMs shifted the cathodic process in the transpassive or active region of plain TiAl, resulting in either case in the dissolution of the alloy due to the absence of an extended passivation region. The cathodic modification of PGM alloyed TiAl occurred as a result of PGM accumulation on the surface of the TiAl alloys, which simultaneously improved the hydrogen evolution efficiency and inhibited anodic dissolution.

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A popular metastable omega phase in body-centered cubic steels

Ping

Geng

2013

Materials Chemistry and Physics

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Corrosion Behavior of a High-Chromium Duplex Stainless Steel with Minor Additions of Ruthenium in Sulfuric Acid

Cited by 11 publications

References 0 publications

Corrosion resistance of laser cladded 304L stainless steel enriched with Ru in hydrochloric acid

Corrosion resistance of laser cladded 304L stainless steel enriched with Ru in hydrochloric acid

Effect of platinum group metal addition on microstructure and corrosion behaviour of Ti–47·5 at-%Al

A popular metastable omega phase in body-centered cubic steels

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