Method for composite delamination

A method for delaminating a composite by immersing the composite into a delamination solution;

• wherein the composite comprises a metal substrate and a coating applied on one side or two sides of the metal substrate, wherein the coating comprises a copolymeric binder;
• wherein the copolymeric binder comprises a structural unit (a), derived from a monomer selected from the group consisting of a carboxylic acid group-containing monomer, a sulfonic acid group-containing monomer, a phosphonic acid group-containing monomer, a carboxylic acid salt group-containing monomer, a sulfonic acid salt group-containing monomer, a phosphonic acid salt group-containing monomer, and combinations thereof;
• wherein the proportion of structural unit (a) within the copolymeric binder is from about 15% to about 30% by mole, based on the total number of moles of monomeric units in the copolymeric binder;
• wherein the delamination solution consists of a delamination agent and an aqueous solvent, wherein the delamination agent is an alkali metal silicate salt with the formula (M2O)x·(SiO2)y, wherein M represents an alkali metal selected from the group consisting of sodium, potassium, rubidium, cesium, and wherein the ratio between x and y is between 1:0.485 and 1:2.76;
• and wherein the aqueous solvent is water.