Composition for surface treatment, method for producing the same, and surface treatment method using the same

A composition for surface treatment, which is for a surface treatment of a polished object to be polished obtained after being polished using a polishing composition containing ceria, the composition for surface treatment comprising:

• a carboxy group-containing (co)polymer having a structural unit derived from a monomer having a carboxy group or a salt group of the carboxy group;
• a SOx or NOy partial structure-containing compound having a partial structure represented by SOx or NOy (where x and y each independently are a real number 1 to 5);
• and
• a dispersing medium, wherein:
• the SOx or NOy partial structure-containing compound is at least one selected from the group consisting of:
• m-xylenesulfonic acid and salts thereof;
• 2-naphthol-6-sulfonic acid and salts thereof;
• p-toluidine-2-sulfonic acid and salts thereof;
• benzenesulfonic acid and salts thereof;
• a compound represented by the following Chemical Formula (4) and salts thereof;
• and 2-(hydroxymethyl)-2-nitro-1,3-propanediol;
• wherein R23 to R28 each independently denote a hydrogen atom, a hydroxy group, a sulfo group, an anionic group which does not have a sulfo group, a cationic group, an alkoxycarbonyl group having 2 to 11 carbon atoms, or a hydrocarbon group having 1 to 20 carbon atoms, and at least one of R23 to R28 is a sulfo group;
• and
• the composition for surface treatment has a pH of 5 or more and 8 or less.