Which metal materials cannot be cleaned with acidic cleaning agents?

Aluminum and Aluminum Alloys: Aluminum is a reactive metal with a protective layer of natural oxide film on its surface. However, acidic cleaning agents can damage this oxide film, reacting with the aluminum and causing corrosion. For example, strong acids such as hydrochloric acid and sulfuric acid will react chemically with aluminum, producing hydrogen gas and the corresponding aluminum salts, causing spots, pitting, or even holes on the surface of aluminum products, affecting their appearance and performance.

Zinc and Zinc Alloys: Zinc is relatively chemically active and readily reacts with acids. Acidic cleaning agents will damage the protective film on the surface of zinc, causing corrosion. Even in a weak acid environment such as acetic acid, zinc will gradually dissolve, causing the surface of zinc alloy products to lose luster, showing corrosion marks, and reducing their mechanical strength and corrosion resistance.

Magnesium and Magnesium Alloys: Magnesium is an extremely active metal with high chemical activity and reacts violently with acids. Acidic cleaning agents will rapidly react with magnesium, producing hydrogen gas and causing severe corrosion on the surface of the magnesium alloy, resulting in bubbling and peeling, seriously affecting its performance and lifespan.

Copper and Copper Alloys (Some): Although copper is relatively unreactive chemically, it can also corrode in certain acidic environments. For example, in the presence of oxidizing acids (such as nitric acid), copper will react with it to produce copper salts and nitrogen oxides. For some copper alloys containing zinc, tin, or other components easily corroded by acids, such as brass and bronze, using acidic cleaning agents may also cause some components in the alloy to be leached out, resulting in changes in surface color and performance degradation.

Lead: Lead can react with many acids, and the reaction accelerates especially in the presence of air. Acidic cleaning agents will damage the oxide film on the surface of lead, corroding the lead metal and producing soluble lead salts. Most lead salts are toxic and can not only damage the metal but also pose a hazard to the environment and human health.