Treatment of steel surfaces

US9528179B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Laszlo Fabry · Burghausen, DE
• Barbara Mueller · Langenau, DE
• Michael Stepp · Braunau am Inn, AT

Key dates

• Filing date: Oct 17, 2012
• Grant date: Dec 27, 2016
• Expiry date: Jun 13, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31663
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The content of phosphorus in polycrystalline silicon prepared by the Siemens process is reduced by treating phosphorus-containing steel surfaces with an α-amino-functional alkoxysilane. The treated surface exhibits less corrosion in an atmosphere of moist hydrogen chloride, and less loss of phosphorus as a result.