Traction reduction effect of iron–tannic acid complex film formation at friction interface between rail and wheel

Abstract

The black leaf film on the top surface of the rail reduces the tangential force between rails and wheels of the railway vehicles. Previous research has indicated that this film is an iron-tannin complex film formed by a reaction between iron in the rail and tannin, a constituent of fallen leaves. This study aims to understand the properties of the artificially prepared iron-tannin complex film and to clarify its effect on tribological properties when formed at the friction interface between rail and wheel. Rolling-sliding friction tests were conducted using rail specimens cut from the head of a 50 kg N standard rail and wheel specimens cut from the block material of a Japanese railway train wheel. When the complex film was formed in advance on the friction surface of the rail, the traction with distilled water supplied was lower than when it was not formed. The complex film formed on the friction surface from tannin supplied as an aqueous solution also significantly reduced the traction between the rail and wheel. The evaluation of complex film properties, using immersion tests of rail specimens, showed that the complex film was soft and reduced the contact angle on the formed surface.

Keywords

Rail and wheel traction iron-tannic acid complex film rolling-sliding friction test coatings

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References

Chen

. Review of various influencing factors and improvement measures on wheel-rail adhesion. Wear 2024; 550–551: 205283.

Pearce

Watkins

. Adhesion and leaves - A review of the problem and potential solutions. Report published by the British Railways. 1987.

Ishizaka

Lewis

. The low adhesion problem due to leaf contamination in the wheel/rail contact: bonding and low adhesion mechanisms. Wear 2017; 378–379: 183–197..

Arias-Cuevas

. Field investigations into the adhesion recovery in leaf-contaminated wheel–rail contacts with locomotive sanders. Proc Inst Mech Eng F J Rail Rapid Transit 2011; 225: 443–456.

Omasta

Machatka

Smejkal

, et al. Influence of sanding parameters on adhesion recovery in contaminated wheel–rail contact. Wear 2015; 322–323: 218–225.

Lewis

Dwyer-Joyce

Lewis

. Disc machine study of contact isolation during railway track sanding. Proc Inst Mech Eng F J Rail Rapid Transit 2003; 217: 11–24.

Ishizaka

Lewis

Hammond

, et al. Chemistry of black leaf films synthesised using rail steels and their influence on the low friction mechanism. RSC Adv 2018; 8: 32506–32521.

Cann

. The “leaves on the line” problem - A study of leaf residue film formation and lubricity under laboratory test conditions. Tribol Lett 2006; 24: 151–158.

Zhu

Olofsson

Nilsson

. A field test study of leaf contamination on railhead surfaces. Proc Inst Mech Eng F J Rail Rapid Transit 2014; 228: 71–84.

10.

Chen

Furuya

Fukagai

, et al. Wheel slip/slide and low adhesion caused by fallen leaves. Wear 2020; 446–447: 203187.

11.

Khanbabaee

Ree

. Tannins: classification and definition. Nat Prod Rep 2002; 18: 641–649.

12.

Hidalgo

Córdoba

Nabais

, et al. New insights into iron-gall inks through the use of historically accurate reconstructions. Herit Sci 2018; 6: 1–15..

13.

Bei

Hou

Zheng

. The inhibition effect of tannic acid on mild steel corrosion in seawater wet/dry cyclic conditions. Corros Sci 2013; 72: 1–9..

14.

EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP). Scientific opinion on the safety and efficacy of tannic acid when used as feed flavouring for all animal species. EFSA J 2014; 12: 3828.

15.

Sungur

Uzar

. Investigation of complexes tannic acid and myricetin with Fe(III). Spectrochim Acta A Mol Biomol Spectrosc 2008; 69: 225–229.

16.

Watson

White

Lewis

, et al. The composition and friction-reducing properties of leaf layers. Proc R Soc A 2020; 476: 20200057.

17.

Chen

Kimura

Ikoma

, et al. Evaluation test of tangential force coefficient under different types of fallen leaves. Wear 2023; 532–533: 205072..

18.

Japanese Industrial Standards. Flat bottom railway rails and special rails for switches and crossings of non-treated steel, JIS E1101.2001. (in Japanese).

19.

Japanese Industrial Standards. Rolling stock-Solid wheel-Part 1: Quality requirements, JIS E5402-1. 2015. (in Japanese).

20.

Ido

Ikoma

Chen

, et al. The removal effect of citric acid on black leaf layer on rail surface caused by fallen leaves. In: 12th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems (CM2022), 2022.

21.

Faria

Silva

Oliveira

. Raman microspectroscopy of some iron oxides and oxyhydroxides. J Raman Spectrosc 1997; 28: 873–878.

22.

Suzumura

Sone

Ishida

, et al. In situ X-ray analytical study on the alteration process of iron oxide layers at the railhead surface while under railway traffic. Wear 2011; 271: 47–53.

23.

Henrik-Klemens

Bengtsson

Björdal

. Raman spectroscopic investigation of iron-tannin precipitates in waterlogged archaeological oak. Stud Conserv 2021; 67: 237–247..

24.

Roberts

. Thin solid lubricant films in space. Tribol Int 1990; 23: 95–104.

25.

Ishizaka

White

Lewis

, et al. Influence of temperature on adhesion coefficient and bonding strength of leaf films: a twin disc study. Wear 2020; 454–455: 203330.

26.

Chen

Yang

, et al. Tannic acid: a crosslinker leading to versatile functional polymeric networks: a review. RSC Adv 2022; 12: 7689–7711..

27.

Ferraris

Cazzola

Spriano

, et al. Grafting of gallic acid to metallic surfaces. Appl Surf Sci 2020; 511: 145615..