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Home Material Sciences Production Of Solderable Chromium-Plated Canned Food Steel Sheet Using The Low-Concentration Electrolytes

Production of solderable tin-free steel using the low-concentration electrolytes

Description

High concentration of chromium anhydride in the chromium-plating electrolytes (220-280 g/l) is the major impediment in the obtaining of tin-free steel. According to the proposed production process, a thin (0.07, 0.14 or 0.21 g/sq.m/side) protective lustrous nanostructurally-texturally-composite chromium coating is obtained on the canned food steel sheet using an electrolyte with a lowered concentration of chromium anhydride (80-120 g/l). Then the chromium-plated steel sheet is passivated using an electrolyte with a lowered concentration of chromium anhydride (10-15 g/l) and soldered with tin solder during the producing of cans.

The basic production items are:

  • The developed chromium-plating technology using the low-concentration electrolyte that provides formation on the canned food steel sheet of a textured coating (0.07-0.21 g/sq.m/side) having a nanocrystal structure. Forming of a nanostructure in chromium coating leads to an increase of its strength while maintaining the plasticity characteristics. The texture forming in chromium coating ensures an adequate corrosion resistance of the passivated chromium-plated steel sheet in various foodstuff media, as well as a sufficient level of mechanical durability of the coating in the production of foodstuff cans.
  • The developed passivating technology using the low-concentration electrolyte that provides formation of a colorless protective film on the chromium-plated steel sheet.
  • The developed technology for soldering of tin-free steel using tin solder. The basis of this technology is the developed flux that ensures the solder spread coefficient 2.2-2.5 (the standard norm being not less than 1.0).

Innovative Aspect

The proposed tin-free steel production process is based on three potential inventions that are grounded on the usage of the recently found phenomenon of the structure formation in the metallic materials being electrochemically deposited through a stage of liquid state (see O.B. Girin. Phase Transformations in the Metallic Materials being Electrodeposited and Their Application for the Development of Advanced Technologies for Anticorrosive Protection of Canned-Food Steel Sheet // Materials Science Forum (Switzerland). – 2007. – V.561-565. – P.2369-2372).

Main Advantages

The major advantages of the production technology:

  • The reduction of chromium anhydride concent-ration in the chromium-plating electrolyte to 80-120 g/l.
  • The reduction of chromium anhydride concent-ration in the passivating electrolyte to 10-15 g/l.
  • The reduction of the chromium coating weight to 0.07-0.21 g/sq.m/side while preserving its protective and decorative properties, with the resulting reduction of the chromium and electric energy consumption.
  • Soldering of tin-free steel becomes commercially feasible.
  • Increase of corrosion resistance of the passivated chromium-plated steel sheet by 1.5 times in comparison with the corrosion resistance of the steel sheet chromium-plated and passivated in more toxic commercial electrolytes.
  • Increase of the current chromium yield to 25-30% during the chromium-plating of canned food steel sheet.
  • Increased rate of chromium deposition onto the steel sheet to 0.01-0.015 m/s.
  • The production process does not require any capital expenditure and is applicable to existing equipment.
  • The developed additives to the flux, chromium-plating and passivating electrolytes are low toxic and not expensive. The synthesis of these additives can be performed at any chemical facility.

Areas of Application

  • Metallurgical industry: production of tin-free steel.
  • Canned food industry: manufacturing of food cans.

Stage of Development

Prototype is available for demonstration and testing, patent and marketing searches have been carried out, secret know-how is present, documents are being prepared for patenting of the inventions.

Contact Details

Ukrainian State University of Chemical Engineering
Contact person: Prof. Oleg Girin
Address: 8, Prospekt Gagarina, Dnipropetrovsk 49005, Ukraine
Теl: (380562) 337136 / 682166 / 679725
Fax: (380562) 337136 / 679725 / 473316
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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