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# c19) United States c12) Patent Application Publication 

# Steele et al. 

# (54) METHOD OF TREATING A METAL SUBSTRATE 

(71) Applicant: Xeros Limited, Rotherham (GB) 

(72) Inventors: John Edward Steele, Rotherham (GB); Robert Andrew Bird, Rotherham (GB) 

(73) Assignee: Xeros Limited, Rotherham (GB) 

(21) Appl. No.: 14/902,506 

(22) PCT Filed: Mar. 3, 2014 

(86) PCT No.: PCT/GB2014/050621 § 371 (c)(l), (2) Date: Dec. 31, 2015 

## (30) Foreign Application Priority Data 

Jul. 5, 2013 (GB) ................................... 1312159.5 

(51) Int. Cl. 

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## Publication Classification 

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(52) U.S. Cl. CPC .......... CllD 1110029 (2013.01); CllD 313719 (2013.01); CllD 313749 (2013.01); CllD 3/2086 (2013.01); CllD 3/28 (2013.01); CllD 3/0073 (2013.01); CllD 313715 (2013.01); CllD 1710013 (2013.01); BOBB 3/08 (2013.01); BOBB 7100 (2013.01); BOBB 3/102 (2013.01); C23C 26100 (2013.01); B24C 1100 (2013.01) 

## (57) ABSTRACT 

A method of cleaning a metal substrate, the method compris› ing exposing the metal substrate to a body of cleaning liquor comprising a cleaning formulation and a multiplicity of solid particles wherein the method further comprises causing the solid particles and the metal substrate to enter into contacting relative movement; wherein i) the cleaning formulation com› prises at least one acid which has a pKa greater than about -1.7; and/or ii) the cleaning formulation comprises at least one base which has a pKb greater than about -1.7; and the length of the particles is from about 0.5 mm to about 6 mm. 

US 20160251602Al 

# c10) Pub. No.: US 2016/0251602 Al 

# (43) Pub. Date: Sep. 1, 2016 

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