How to distinguish stainless steel screws, galvanized and nickel-plated screws

The way to distinguish stainless steel screws, galvanized and nickel-plated screws from the appearance is to look at the color of the screws, the color of stainless steel screws is close to the primary color of iron, galvanized screws are white, color, black, nickel-plated screws are very bright silver: in addition, magnets, oxidants and strong acids and alkali can also be used to distinguish stainless steel screws, galvanized and nickel-plated screws.

How to distinguish stainless steel screws, galvanized and nickel-plated screws from the appearance?

First distinguish by color:

Stainless steel screws are the primary color of iron.

Galvanized screws are white, colored and black.

Nickel-plated screws are silver.

1, stainless steel screws are stainless steel material, stainless steel color is mainly iron and carbon alloy, so the color is close to the color of iron;

2, galvanized screws surface galvanized white zinc, color zinc, black zinc, etc., so the color of galvanized screws is generally white, color, black;

3. The color of nickel-plated screws is related to nickel, generally showing a very bright silver.

There are other ways to distinguish stainless steel screws, galvanized and nickel-plated screws

1, with magnets to distinguish: stainless steel is generally not magnetic, can not be absorbed by magnets is stainless steel screws, galvanized and nickel-plated screws can be absorbed by magnets.

2, distinguish by oxidizing agent: metal nickel has a strong passivation ability, electroplating can quickly generate a thin layer of passivation on the surface, so the surface of nickel plated screw has a passivation film, galvanized surface is a layer of zinc, stainless steel surface is nothing, can be distinguished by strong oxidizing agent.

3, with strong acid and alkali distinguish: stainless steel containing chromium and nickel, has a strong anti-corrosion performance, is not corroded by strong acid and alkali, nickel-plated screw surface has a passivation film, by strong acid and alkali erosion is slower, galvanized screws are corroded the fastest.