How to distinguish between 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 original color of iron. Galvanized screws are white, colored, and black.

Nickel-plated screws are very bright silver: Also, magnets, oxidizers, and strong acids and alkalis can be used to distinguish their difference

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 material

Galvanized screws are white, colored and black.

The nickel-plated screws are silver.

1. Stainless steel screws are made of stainless steel. The color of stainless steel is mainly an alloy of iron and carbon, so the color is close to that of material;

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

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

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

1. Use magnets to distinguish: stainless steel is generally not magnetic, and stainless steel screws can not be attracted by magnets. Galvanized and nickel-plated screws can be attracted by magnets.

2. Distinguish with oxidizer: metallic nickel has a strong passivation ability, and a very thin passivation layer can be quickly formed on the surface during electroplating,

so there is a passivation film on the surface of nickel-plated screws, and a layer of galvanized surface Zinc and stainless steel have nothing on the surface and can be distinguished by strong oxidants.

3. Use strong acid and strong alkali to distinguish: stainless steel contains chromium and nickel, which has strong corrosion resistance and is not corroded by strong acids and alkalis.

There is a passivation film on the surface of nickel-plated screws, which is slowly corroded by strong acids and alkalis. Galvanized screws Corroded fastest.