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One of the ways to control corrosion is by using an inhibitor. Many alternative inhibitors have been used to control it. One of the inhibitors that can be used is inorganic inhibitor or chemical inhibitor. The use of inhibitor is indeed suitable to be applied to control corrosion attacks on internal pipes. The purpose of this study is to determine the effectiveness of the inhibitors used, the form of corrosion occurred, and the effect of the occurrence of corrosion on the hardness of the material given by the inhibitors. The test results in this study indicate that the use of sodium acetate and sodium nitrite is effective to inhibit corrosion attack rates. And based on the experiments, the form of corrosion that occurs is evenly corrosion.