US 20160251602Al  c19)  United States  c12)  Patent Application Publication  Steele et al.  c10)  Pub. No.: US 2016/0251602 Al  (43)  Pub. Date:  Sep. 1, 2016  (54)  METHOD OF TREATING A METAL  SUBSTRATE  B24C 1100  BOBB 3/08  BOBB 7100  BOBB 3/10  C23C 26100  C11D3/37  C11Dl7/00  (2006.01)  (2006.01)  (2006.01)  (2006.01)  (2006.01)  (2006.01)  (2006.01)  (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)  (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  (51)  Int. Cl.  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.  Jul. 5, 2013  (GB) ................................... 1312159.5  (30)  Foreign Application Priority Data  Publication Classification  (57)  ABSTRACT  CllD 11100  C11D3/20  C11D3/28  C11D3/00  (2006.01)  (2006.01)  (2006.01)  (2006.01) 