Since I'm a big fan of blender, I really didn't like the need to resort to Substance to get a quick good result. For a long period of time I studied the nodes and over time created my own shader templates. I present to your attention the "damage shader on metal". Called to facilitate and speed up our work. I will post more of these shaders in the future. I hope it helps you :)

Update 1.1 

- Minor rust roughness fix.
- In file 1.1 put 5 small presets of damage material.

How to bake finished textures

What's inside?

You get 1 ready-to-use material groups

This shader allows you to quickly tweak metal damage, making your work faster.

You can apply this shader to absolutely any existing material. All you need to do is add this group of nodes before the material output.

Inside the shader, the first thing you need to do is set the metal color and rust color.

Value

Control over the strength of the influence of damage. The lower the value, the stronger the damage.

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Noise Scale and Noise Detail 

The amount of noise that is applied to the damage. Suitable for different levels of roughness and also for different sizes of objects. Zero parameters for small objects, high for large ones. But it's better to experiment for better results.

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Small Damage Scale and Power

Small damage from normal wear and tear throughout the metal. At large scale and strength, the effect of metal corrosion is obtained. With low chipping and damage. I will also add light scratches shortly as one of the stages in the damage.

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Gloss, Metal Roughness, Damage Roughness, Rust Normal Power

Standard parameters of any shader. Gloss affects the specularity of the metal, Roughness affects the roughness of the metal. Damage Roughness affects the roughness of the transition between them (rust). Noise power on the damaged part.

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Rust Power and Rust Spread

They affect the strength of wear and the strength of rust manifestation.

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Based Mode

The strength of the influence of the main parameters from which the damage shader repels

Pointiness Based

The main parameter Pointiness, the higher it is, the stronger the damage repels from the sharpness of the mesh

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AO Based

The main AO parameter, the higher it is, the more damage is repelled from the base Ambient Occlusion node

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Bevel Based

The main basic parameter for receiving damage in chamfer areas. Mainly used for fine wear on corners.

Bevel Radius

Mainly used at very low settings to achieve a wrinkled effect on the edges.

Bevel Power

Affects the display strength of the chamfer

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Custom Damage ADD

Custom ADD Damage Based
Connect your image for more control. Where in white paint the places where you want to generate wipes.

Image / Color

Image input

Image Clamp
Allows you to create a clip of the past, to reduce damage

Image Power

Enhances the white color in the image resulting in increased damage

Custom Subtract Damage

Custom Subtract Damage Based
Connect your image in order to remove damage in those places where you consider them unnecessary

Image / Color
Image input

Image Clamp
Clamps the white spectrum to narrow the area to be restored

Image Power

Strengthens the white spectrum to increase the area and strength of the restoration area

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