Patent ID: 11898097
Assignee: DORF KETAL CHEMICALS FZE
Field: Civil engineering (Other fields)
Classification: CPC C  E | IPC C  E

Claim 19:
20. A method of treating a metal surface with a composition comprising:
HCl;
an amino acid; and
an alkanolamine;
wherein the HCl: alkanolamine/amino acid are present in a molar ratio of not more than 15:1,
wherein the amino acid is selected from the group consisting of: lysine, glycine, valine, arginine, histidine, methionine and combinations thereof;
wherein the composition has a pH of less than 1;
said method comprising the steps of:
providing said composition;
exposing said metal surface to said composition;
allowing said composition a sufficient period of time to act upon said surface; and
optionally, removing the acid composition when the exposure time has been determined to be sufficient for the operation to be complete or sufficiently complete.