Sarcosine compound used as corrosion inhibitor

1. A post CMP clean agent, consisting essentially of a sarcosine compound or salt thereof as a corrosion inhibitor, in combination with an acidic compound and an aqueous solvent,

wherein the sarcosine compound has the formula:

wherein R is N-acyl, and the acyl group is cocoyl.

2. The post CMP clean agent as described in claim 1 , wherein the acidic compound is selected from the group consisting of citric acid, oxalic acid, phosphoric acid, amino trimethyl phosphonic acid, 1-hydroxyethylidene-1,1-diphosphoric acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, nitrilotrismethylenetriphosphonic acid, hexamethylene diamine tetra methylene phosphonic acid, diethylene triamine penta methylene phosphonic acid, hexamethylene triamine penta methylene phosphonic acid, malonic acid, lactic acid, acetic acid, propionic acid, butanoic acid, pentanoic acid, hexanoic acid, succinic acid, adipic acid, malic acid, maleic acid, tartaric acid, methanesulfonic acid, benzenesulfonic acid, toluenesulfonic acid, dodecylbenzenesulfonic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, nitrilotriacetic acid, N-(hydroxyethyl)-ethylenediaminetriacetic acid or combinations thereof.

3. The post CMP clean agent, as described in claim 1 , wherein said salt is selected from the group consisting of lithium, sodium, potassium and amine.

4. The post CMP clean agent, as described in claim 1 , wherein the aqueous solvent is water.