The influence of long term use of inhibitors in hydrochloric acid pickling baths on hydrogen induced stress corrosion cracking

Feser, R.; Friedrich, Axel; Scheide, F.

doi:10.1002/1521-4176(200209)53:9<637::aid-maco637>3.0.co;2-p

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…One of the solutions to deal with this problem is the addition of inhibitors in the pickling solution. Inhibitors are specifically adsorbed in places where the base steel is exposed to form thin layers that prevent the attack of the metal by acid (Feser et al, 2002;Yang et al, 2020). Another practical method is to reduce the immersion time of the metal in the pickling solution and thus reduce the absorption of hydrogen (Staley, 1926a;Yang et al, 2020).…”

Section: Carbon Steel Pickling With Chlo-ridic Acidmentioning

confidence: 99%

Acid pickling of carbon steel

Anderez

López

2022

revmetal

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This study reviews the possibilities of recovering the pickling waters from carbon and galvanised steel. Acid pickling with hydrochloric acid (HCl) is the most widely used chemical process to remove iron oxides from the metal surface without any significant attack on the steel itself. The acid pickling bath contains mainly ferrous chloride (FeCl2) produced by the reaction between the steel and free hydrochloric acid. However, zinc chloride (ZnCl2) is also found in the pickling of carbon steel parts prior to galvanisation, as the hooks and tools used to hang the carbon steel parts are also galvanised and reuse again polluting with Zn the pickling waters. Pickling water recovery or recycling technologies primarily seek the reuse of HCl in two ways. Partially by recovering the unreacted HCl or fully by breaking the FeCl2 bond through Pyrolysis technologies such as fluidised bed and spray roasting which in turn produces another iron oxide by-product. However, the most common by-product produced by pickling water recovery and recycling technologies is ferric chloride (FeCl3), as it is a coagulant widely used in wastewater treatment. However, if the pickling water contains ZnCl2 or other metals, the production of FeCl3 becomes unattractive and the pickling water is neutralised and deposited in landfill sites. This study also discusses a wide range of technologies capable of recovering all or part of the pickling water, including galvanic pickling water, that are usually excluded from circular economy strategies.

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Section: Carbon Steel Pickling With Chlo-ridic Acidmentioning

confidence: 99%

Acid pickling of carbon steel

Anderez

López

2022

revmetal

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Section: Introductionmentioning

confidence: 99%

“…Freser et al investigated the inhibitor influence on the absorption of hydrogen by steel in hydrochloric acid pickling baths and showed that the permeation phenomenon increases with increasing aging of the pickling solution. [11] To sum up, the measurements (titrations) that are normally carried out online to check the solution aggressiveness do not actually provide indications of the inhibition efficiency. Trusting exclusively on them to dose inhibitor and acid paves the way to the risk of either insufficient mitigation of corrosion phenomena or excessive use of inhibitor.…”

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confidence: 99%

Application of Hydrogen Permeation Techniques to Assess the Effect of Inhibitors in Hydrochloric Steel Pickling of Low‐C Steels and Interstitial‐Free Steels

Colla,

Valentini,

Di Giorgio

2024

steel research int.

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The acid pickling phase, generally entrusted to HCl‐based solutions, plays a fundamental role in the production of low‐C and interstitial‐free steel coils. Very often, however, pickling operations are challenging due to the possible onset of surface defects (underpickling, overpickling, appearance of surface defects, etc.) linked to complex phenomena involving numerous factors, such as acid concentration, Fe ions in solution, temperature, time, steel type, and scale structure. Moreover, the use of inhibitors, which is essential for controlling the pickling process, represents one of the major challenges. Their dosage, although minimal, must be carefully chosen based on the type of processed coils and other plant engineering variables. The flow of hydrogen that is generated on the surface of the steel during etching causes absorption of hydrogen by the metal and its measurement is strictly linked to the phenomena occurring during scale removal. The correlation of data obtained from a Devanathan double‐cell hydrogen permeation system to results of other techniques, such as weight loss, surface analysis, metallography, and electron microscopy shows that this system can be effectively used to indirectly measure the solution aggressiveness. This experimental approach is applied to two industrial steels: a simple carbon base and an interstitial free Ti steel.

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Experimental and theoretical study on the behaviour of a pickling solution: The role of ferrous ions

Yang

Fang

et al. 2020

Journal of Cleaner Production

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The influence of long term use of inhibitors in hydrochloric acid pickling baths on hydrogen induced stress corrosion cracking

Cited by 3 publications

References 2 publications

Acid pickling of carbon steel

Acid pickling of carbon steel

Application of Hydrogen Permeation Techniques to Assess the Effect of Inhibitors in Hydrochloric Steel Pickling of Low‐C Steels and Interstitial‐Free Steels

Experimental and theoretical study on the behaviour of a pickling solution: The role of ferrous ions

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